Corken 291 / F291 Compressor

Specifications	Model
Specifications	291/F291
Bore of cylinder: inches (mm)	3.0 (76.2)
Stroke: inches (mm)	2.5 (63.5)
Piston displacement cfm (m3/hr) minimum @ 400 RPM maximum @ 825 RPM	8.2 (13.9) 16.9 (28.7)
Maximum working pressure: psig (bar g)	335 (23.1)
Maximum brake horsepower: hp (kW)	15 (11)
Maximum rod load: lb (kg)	3,600 (1,633)
Maximum outlet temperature: °F (°C)	350 (177)
Minimum inlet temperature: °F (°C)	-25 (-32)
Bare unit weight: lb (kg)	210 (95.2)
Maximum flow-propane: gpm (m3/hr)	101 (22.9) b
Class 300 RF flange/DIN flange option	Yes

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Standard 107 Items

Steel baseplate
V-belt drive
Adjustable driver side base
Enclosed steel guard
Suction and discharge
pressure gauges
40 Micron strainer
Non-lube 4-way valve
Interconnecting piping
Liquid trap as specified below

107 Mounting

Mechanical liquid trap with ball float

107A Mounting

Automatic liquid trap with one NEMA 7 liquid level switch

107B Mounting

Automatic liquid trap with two NEMA 7 liquid level switches

107F Mounting

107A or 107B with Class 300 RF flanged components and connections

Standard 109 Items

Steel baseplate
V-belt drive
Adjustable driver side base
Enclosed steel guard
Suction and discharge pressure gauges
40 Micron strainer
Non-lube 4-way valve
Interconnecting piping
Liquid trap as specified below

109 Mounting

Mechanical liquid trap with ball float

109A Mounting

Automatic liquid trap with one NEMA 7 liquid level switch

109B Mounting

Automatic liquid trap with two NEMA 7 liquid level switches

109F Mounting

109A or 109B with Class 300 RF flanged components and connections

Mounting Style	Description	Part No.	Model Reference	Ship Weight (Ib) Compressor w/ Mounting
103 Style	Mounting includes steel baseplate, adjustable driver slide base, V-belt drive and enclosed belt guard. Pressure gauges are mounted on the compressor.	103-4 (a) (b)	291AM3FBANSNN	305
103HD	Heavy duty version of the 103 mounting listed above	103HD-4 (a) (b)	291AM3FBANHNN	-
107 Style	Mounting includes steel baseplate, mechanical liquid trap, non-lube 4-way valve, interconnecting piping, strainer, adjustable driver slide base, V-belt drive and enclosed belt guard. Pressure gauges are mounted on the compressor	107-18 (a) (b) 107-3 (a) (b)	F291AM3FBANSNN 291AM3FBANSNN	400 400
107A Style	Mounting includes steel baseplate, automatic liquid trap with NEMA 7 liquid level switch to stop compressor. Non-lube 4-way valve, interconnecting piping, strainer, adjustable driver slide base, V-belt drive and enclosed belt guard. Pressure gauges are mounted on the compressor.	107A-3 (a) (b)	291AM3FBANSNN	400
107B Style	Mounting includes steel baseplate, ASME code liquid trap with two NEMA 7 liquid level switches for alarm and to stop compressor. Non-lube 4-way valve interconnecting piping, strainer and adjustable driver slide base, V-belt drive and enclosed belt guard. Pressure gauges are mounted on the compressor.	107B-3 (a) (b)	291AM3FBANSNN	720
107TR Style	Mounting set up to be used as a transport unit. Mounting includes steel baseplate, mechanical liquid trap, non-lube 4-way valve, interconnecting piping, and strainer. Pressure gauges are mounted on the compressor.	107TR-30	291AE3FBANENN	300
109 Style	Mounting includes steel baseplate, mechanical liquid trap, interconnecting piping, adjustable driver slide base, V-belt drive and enclosed belt guard. Pressure gauges mounted on the compressor.	109-4 (a) (b)	291AM3FBANSNN	375
109A Style	Mounting includes steel baseplate, automatic liquid trap with NEMA 7 liquid level, switch to stop compressor, interconnecting piping, adjustable driver slide base, V-belt drive and enclosed belt guard. Pressure gauges are mounted on the compressor.	109A-4 (a) (b)	291AM3FBANSNN	375
109B Style	Mounting includes steel baseplate, ASME automatic liquid trap with two NEMA 7, liquid level switches for alarm and to stop compressor, interconnecting piping, adjustable driver slide base, V-belt drive and enclosed belt guard. Pressure gauges are mounted on the compressor.	109B-4 (a) (b)	291AM3FBANSNN	695
109TR Style	Mounting set up to be used as a transport unit. Mounting includes steel baseplate, mechanical liquid trap, and interconnecting piping. Pressure gauges are mounted, on the compressor.	109TR-40	291AE3FBANENN	280

Please note:
Above mountings are not applicable to the flanged compressors models F91–F691.
(a) Specify compressor speed
(b) Specify motor frame size (motor frequency / hertz)
(e) These units are not supplied with relief valves. A relief valve must be installed that is suitable for the service relief valve(s).
(f) Compressors must be equipped with extended crankshaft and special flywheel in order to use this mounting.

Service	Capacity 1	Displacement cfm	Compressor		Driver Sheave Size P.D." 2		Driver Horsepower				Piping Size 3
			Compressor		Driver Sheave Size P.D." 2		Liquid Transfer and Residual Vapor Recovery		Liquid Transfer without Residual Vapor Recovery		Piping Size 3
			Model	RPM	1,750 RPM	1,450 RPM	100°F	80°F	100°F	80°F	Vapor	Liquid
Small bulk plants	23	4	91	400	A 3.0	B 3.6	5	3	3	3	3/4	1-1/4
	29	5	91	505	B 3.8	B 4.6	5	5	5	5	3/4	1-1/4
	34	6	91	590	B 4.6	B 5.6	5	5	5	5	1	1-1/4
	40	7	91	695	B 5.4	B 6.6	5	5	5	5	1	1-1/2
	39	7	291	345	A 3.0	A 3.6	3	3	3	3	1	1-1/2
Unloading single tank car or transport	45	8	91	800	B 6.2	B 7.4	7-1/2	7-1/2	7-1/2	7-1/2	1	1-1/2
	44	8	291	390	A 3.4	B 4.0	5	3	3	3	1	1-1/2
	50	9	291	435	A 3.8	B 4.6	5	5	3	3	1	1-1/2
	56	10	291	490	B 4.4	B 5.2	5	5	5	5	1	2
	61	11	291	535	B 4.8	B 5.8	5	5	5	5	1	2
	66	12	291	580	B 5.2	B 6.2	7-1/2	5	5	5	1	2
	71	13	291	625	B 5.6	B 6.6	7-1/2	5	7-1/2	5	1-1/4	2
	79	14	291	695	B 6.2	B 7.4	7-1/2	7-1/2	7-1/2	7-1/2	1-1/4	2
	84	15	291	735	B 6.6	B 8.0	10	7-1/2	10	7-1/2	1-1/4	2-1/2
	84	15	491	345	A 3.0	A 3.6	7-1/2	7-1/2	5	5	1-1/4	2-1/2
	89	16	291	780	B 7.0	B 8.6	10	10	10	10	1-1/4	2-1/2
	89	16	491	370	A 3.2	A 3.8	7-1/2	7-1/2	7-1/2	5	1-1/4	2-1/2
Unloading two or more tank cars at one time or large transport with excess flow valves of adequate capacity	95	17	491	390	A 3.4	B 4.0	7-1/2	7-1/2	7-1/2	7-1/2	1-1/4	3
	101	18	491	415	A 3.6	B 4.4	10	7-1/2	7-1/2	7-1/2	1-1/4	3
	106	19	491	435	A 3.8	B 4.6	10	7-1/2	7-1/2	7-1/2	1-1/4	3
	108	20	491	445	B 4.0	B 4.8	10	7-1/2	7-1/2	7-1/2	1-1/4	3
	114	21	491	470	B 4.2	B 5.0	10	7-1/2	7-1/2	7-1/2	1-1/4	3
	119	22	491	490	B 4.4	B 5.2	10	10	7-1/2	7-1/2	1-1/4	3
	125	23	491	515	B 4.6	B 5.6	10	10	10	7-1/2	1-1/4	3
	130	24	491	535	B 4.8	B 5.8	15	10	10	10	1-1/4	3
	136	25	491	560	B 5.0	B 6.0	15	10	10	10	1-1/4	3
	141	26	491	580	B 5.2	B 6.2	15	10	10	10	1-1/4	3
	147	27	491	605	B 5.4	B 6.4	15	10	15	10	1-1/4	3
	152	28	491	625	B 5.6	B 6.6	15	15	15	15	1-1/2	3
	158	29	491	650	B 5.8	B 7.0	15	15	15	15	1-1/2	3
	163	30	491	670	B 6.0		15	15	15	15	1-1/2	3
	163	30	691	400	B 4.4	B 5.2	15	15	10	10	1-1/2	3
	168	31	491	695	B 6.2	B 7.4	15	15	15	15	1-1/2	3
	171	31	691	420	B 4.6	B 5.6	15	15	10	10	1-1/2	3
	179	32	491	740	B 6.6	B 8.0	15	15	15	15	1-1/2	3
	178	32	691	440	B 4.8	B 5.8	15	15	10	10	1-1/2	3
	186	34	691	455	B 5.0	B 6.0	15	15	15	10	1-1/2	3
	193	35	691	475	B 5.2	B 6.2	15	15	15	10	1-1/2	3
	200	36	691	495	B 5.4	B 6.4	15	15	15	15	1-1/2	3
Unloading large tank cars, multiple vessels, barges or terminals	208	38	691	510	B 5.6	B 6.8	20	15	15	15	1-1/2	4
	215	39	691	530	B 5.8	B 7.0	20	15	15	15	1-1/2	4
	223	41	691	550	B 6.0	A 7.0	20	15	15	15	1-1/2	4
	230	42	691	565	B 6.2	B 7.4	20	15	15	15	2	4
	237	43	691	585	B 6.4	A 7.4	20	15	15	15	2	4
	245	45	691	605	B 6.6	B 8.0	20	15	15	15	2	4
	252	46	691	620	B 6.8		20	20	15	15	2	4
	260	47	691	640	B 7.0	A 8.2	20	20	20	15	2	4
	275	48	691	675	B 7.4	B 8.6	25	20	20	20	2	4
	297	54	691	730	B 8.0	B 9.4	25	20	20	20	2	4
	319	58	691	785	B 8.6		25	20	25	20	2	4
	334	60	691	820	TB 9.0	A 10.6	30	25	25	20	2	4
	452	82	D/FD891	580	5V 7.1	5V 8.5	30	30	30	30	3	6
	623	113	D/FD891	800	5V 9.75	5V 11.8		40	40	30	3	6

Service	Capacity 1	Displacement cfm	Compressor		Driver Sheave Size P.D." 2		Driver Horsepower				Piping Size 3
			Compressor		Driver Sheave Size P.D." 2		Liquid Transfer and Residual Vapor Recovery		Liquid Transfer without Residual Vapor Recovery		Piping Size 3
			Model	RPM	1,750 RPM	1,450 RPM	100°F	80°F	100°F	80°F	Vapor	Liquid
Small bulk plants	23	4	91	400	A 3.0	B 3.6	5	3	3	3	3/4	1-1/4
	29	5	91	505	B 3.8	B 4.6	5	5	5	3	3/4	1-1/4
	34	6	91	590	B 4.6	B 5.6	5	5	5	5	1	1-1/4
	40	7	91	695	B 5.4	B 6.6	5	5	5	5	1	1-1/2
	43	7	291	345	A 3.0	A 3.6	5	3	3	3	1	1-1/2
Unloading single tank car or transport	46	8	91	800	B 6.2	B 7.4	7-1/2	5	5	5	1	1-1/2
	45	8	291	390	A 3.4	B 4.0	5	3	3	3	1	1-1/2
	50	9	291	435	A 3.8	B 4.6	5	5	3	3	1	1-1/2
	56	10	291	490	B 4.4	B 5.2	5	5	5	3	1	2
	62	11	291	535	B 4.8	B 5.8	7-1/2	5	5	5	1	2
	67	12	291	580	B 5.2	B 6.2	7-1/2	5	5	5	1	2
	72	13	291	625	B 5.6	B 6.6	7-1/2	5	5	5	1-1/4	2
	80	14	291	695	B 6.2	B 7.4	7-1/2	7-1/2	7-1/2	5	1-1/4	2
	85	15	291	735	B 6.6	B 8.0	10	7-1/2	7-1/2	7-1/2	1-1/4	2-1/2
	85	15	491	345	A 3.0	A 3.6	7-1/2	7-1/2	5	5	1-1/4	2-1/2
	90	16	291	780	B 7.0	B 8.6	10	7-1/2	7-1/2	7-1/2	1-1/4	2-1/2
	90	16	491	370	A 3.2	A 3.8	10	7-1/2	5	5	1-1/4	2-1/2
Unloading two or more tank cars at one time or large transport with excess flow valves of adequate capacity	96	17	491	390	A 3.4	B 4.0	10	7-1/2	5	5	1-1/4	3
	102	18	491	415	A 3.6	B 4.4	10	7-1/2	7-1/2	7-1/2	1-1/4	3
	107	19	491	435	A 3.8	B 4.6	10	7-1/2	7-1/2	7-1/2	1-1/4	3
	110	20	491	445	B 4.0	B 4.8	10	7-1/2	7-1/2	7-1/2	1-1/4	3
	115	21	491	470	B 4.2	B 5.0	10	7-1/2	7-1/2	7-1/2	1-1/4	3
	120	22	491	490	B 4.4	B 5.2	15	10	7-1/2	7-1/2	1-1/4	3
	126	23	491	515	B 4.6	B 5.6	15	10	7-1/2	7-1/2	1-1/4	3
	131	24	491	535	B 4.8	B 5.8	15	10	10	7-1/2	1-1/4	3
	138	25	491	560	B 5.0	B 6.0	15	10	10	7-1/2	1-1/4	3
	142	26	491	580	B 5.2	B 6.2	15	10	10	7-1/2	1-1/4	3
	148	27	491	605	B 5.4	B 6.4	15	10	10	10	1-1/4	3
	153	28	491	625	B 5.6	B 6.6	15	10	10	10	1-1/2	3
	160	29	491	650	B 5.8	B 7.0	15	15	10	10	1-1/2	3
	165	30	491	670	B 6.0		15	15	15	10	1-1/2	3
	165	30	691	400	B 4.4	B 5.2	15	15	10	10	1-1/2	3
	170	31	491	695	B 6.2	B 7.4	15	15	15	10	1-1/2	3
	173	31	691	420	B 4.6	B 5.6	15	15	10	10	1-1/2	3
	181	32	491	740	B 6.6	B 8.0	15	15	15	15	1-1/2	3
	180	32	691	440	B 4.8	B 5.8	15	15	10	10	1-1/2	3
	188	34	691	455	B 5.0	B 6.0	20	15	10	10	1-1/2	3
	195	35	691	475	B 5.2	B 6.2	20	15	10	10	1-1/2	3
	203	36	691	495	B 5.4	B 6.4	20	15	15	10	1-1/2	3
Unloading large tank cars, multiple vessels, barges or terminals	211	38	691	510	B 5.6	B 6.8	20	15	15	10	1-1/2	4
	218	39	691	530	B 5.8	B 7.0	20	15	15	15	1-1/2	4
	226	41	691	550	B 6.0	A 7.0	20	15	15	15	1-1/2	4
	233	42	691	565	B 6.2	B 7.4	20	15	15	15	2	4
	240	43	691	585	B 6.4	A 7.4	20	20	15	15	2	4
	248	45	691	605	B 6.6	B 8.0	20	20	15	15	2	4
	255	45	691	620	B 6.8		25	20	15	15	2	4
	263	47	691	640	B 7.0	A 8.2	25	20	15	15	2	4
	278	48	691	675	B 7.4	B 8.6	25	20	15	15	2	4
	301	54	691	730	B 8.0	B 9.4	25	20	20	15	2	4
	323	58	691	785	B 8.6		30	25	20	20	2	4
	338	60	691	820	TB 9.0	A 10.6	30	25	20	20	2	4
	459	82	D/FD891	580	5V 7.1	5V 8.5	40	30	30	30	3	6
	633	113	D/FD891	800	5V 9.75	5V 11.8		40	40	30	3	6

Compressor repair Kits

part number	3550-x1
model number	290K3, 291m3
Suction valve assembly	3483-1X (2)²
discharge valve assembly	3485-X (2)²
Valve cage	—
Connecting rod bearing (pair)	1367 (2)2
Packing set	1452-1X1 (2)²
Piston rings	1772 (6)²
ring expanders	1775 (6)²
Gasket set¹	1281-XA¹
O-ring¹	—
O-ring¹	—
O-ring¹	—
Oil seal	1278
Oil seal	—
Adapter plate gasket	—

Model 291 gasket set (1281-xA)

part number	description	Quantity
1281	Filter screen screw gasket	1
1651	Inspection plate gasket	1
2-113A	O-ring, buna-N	2
2-228A	O-ring, buna-N	1
2702	Crankcase gasket	1
2716	Valve cap gasket, aluminum	4
2732	Center headbolt gasket - steel	2
1190	Adapter plate gasket	2
1285	bearing carrier gasket	1
2-031A	O-ring, buna-N	4
2-135A	O-ring, buna-N	2
2-235A	O-ring, buna-N	4
2713	Crankcase inspection plate gas	1
2717	Valve gasket, aluminum	4

Piston Assembly number 1983-x

ref no.	part no.	description	Qty
1.	7002-010OC100A	Screw, socket head	4
1.	7207-010A	Lock washer	4
2.	1983	Head, iron	1
3.	1775	ring expander	3
4.	1772	Piston ring	3
5.	1482	Locknut	1
6.	1483	Lock pin	1
7.	1984	Piston platform	1
8.	1528	Shim washer, thick	As req.
8.	1528-1	Shim washer, thin	As req.
9.	1527	Thrust washer	1

Connecting rod Assembly

ref no.	part no.	description
1.	1132-X2a	Crosshead assembly
2.	1498	retainer ring
3.	2505	Wrist pin
4.	1846-Xa,b	Wrist pin bushing
5.	1599b	bolt
6.	1889-X	Connecting rod assembly
7.	1889b	Connecting rod
8.	1367b	Connecting rod bearing
9.	1600b,c	Nut

Flywheel Assembly

Assembly number	Assembly name
2549-X1	Flywheel assembly (flywheel, hub, and three bolts)
2549	Flywheel: 16" O.d., 3 groove
H SF-1.250	Hub with three bolts and lockwashers

Four-Way Valve Repair Kits

description	trim	part number	Connection sizes
Four-Way Valve repair Kits	PTFE and buna-N trim	3122-X	1"
		3123-X	1¼"
		3130-X	2"

Head and valve

ref no.	part no.	description
1.	2912	Head model 291
	2912-X1	Head assy. for model 291 (spec 3)
	2912-X2	Head assy. for model 291 (spec 4)
2.	4300	Head model F291 (ANSI flange)
3.	7001-037 NC100A	bolt, 3/8-16 x 1" Gr.5 hex head
4.	2731	Center headbolt
4.	2732	Gasket for center headbolt
5.	2-235_b	O-ring
6.	2-113_b	O-ring
7.	2714-1	Valve cap
8.	2-031_b	O-ring
9.	2715	Holddown screw
10.	3483-1X	Suction valve assy. (spec 3)
	3483-1X1a	Same as above but with copper gaskets
	3483-1X2a	Same as above but with iron-lead gaskets
11.	3483-X	Suction valve assy. (spec 4)
	3483-X1a	Same as above but with copper gaskets
	3483-X2a	Same as above but with iron-lead gaskets
12.	3485-X	discharge valve assy. (all specs)
	3485-X1a	Same as above but with copper gaskets
	3485-X2a	Same as above but with iron-lead gaskets
13.	2717	Valve gasket (aluminum)
	2717-1a	Valve gasket (copper)
	2717-2a	Valve gasket (iron-lead)
14.	5000-77	retainer ring (spec 3)
15.	3977	Suction valve relief housing
16.	1411	Spring (spec 3)
17.	1410	ball (spec 3)
18.	3483-1	Suction valve seat (spec 3)
19.	3972	Suction valve plate (spec 3)
20.	4009	Suction spring (spec 3)
21.	3484	Suction valve bumper (spec 3)
22.	3483	Suction valve seat (spec 4)
23.	3972	Suction valve plate (spec 4)
24.	4009	Suction spring (spec 4)
25.	3484	Suction valve bumper (spec 4)
26.	3486	discharge valve bumper
27.	4008	discharge spring
28.	3973	discharge valve plate
29.	3485	discharge valve seat

Crankcase Assembly bill of materials

ref no.	part no.	description
1.	1278	Oil seal
2.	7001-037NC075A	bolt, 3/8-16 x 3/4, hex head
3.	2957	bearing cover
4.	1273	bearing adjustment shim (0.005")
	1273-1	bearing adjustment shim (0.007")
	1273-2	bearing adjustment shim (0.020")
5.	1500	bearing cup
6.	1368-X	Oil bayonet
7.	2713	Crankcase inspection plate gasket
8.	2958	Crankcase inspection plate
9.	2-112_^c	O-ring
10.	2955^a,b	Crankcase
11.	1279	breather cap
12.	2-111_^c	O-ring (breather cap)
13.	2796	breather ball
14.	1483	Lock pin - 1/8 x 1"
15.	1671	Flywheel key
16.	1501	bearing cone
17.	1341-X1	Crankshaft assembly with 1284 (2), 1286, 1341, 1501, 2590, 2719
18.	1284	Crankshaft orifice (2)
19.	2719	bearing cone
20.	1286	Pump shaft drive pin
21.	2590	Pipe plug - 1/8 NPT, flush seal
22.	1280	Filter screen screw
23.	1281	Filter screen screw gasket
24.	2-116_^c	O-ring (filter screen)
25.	1276	Filter screen washer
26.	1275	Oil filter screen
27.	3289	Pipe plug - 1/4 NPT, flush seal
28.	1661	Pipe plug - 3/8 NPT
29.	1290	relief valve adjusting screw
30.	1291	Adjusting screw locknut
31.	2-011_^c	O-ring (relieve valve adjustment screw)
32.	1292	relief valve spring
33.	1293	relief valve ball
34.	2718	bearing cup
35.	2961-X	Air release valve assembly with 2961, 2962, 2963
36.	1285	bearing carrier gasket
37.	2956	bearing carrier
38.	2-218_^c	O-ring (closure body) (2 required) (Spec 3, 4, 8, 9 only)
39.	1515-X	Closure cap assembly including 2-218A(2) (Spec 3, 4, 8, 9 only)
40.	7001-025NC050A	bolt, 1/4-20 x 1/2, hex head
41.	1302	Oil pressure gauge
42.	2-228_^c	O-ring (pump cover)
43.	4222-X	Oil filter assembly
44.	1629	Pipe plug - 1/16 NPT, flush seal
45.	7001-037NC100A	bolt, 3/8-16 x 1, hex head
46.	2805	Pump shaft bushing
47.	2850	Pump shaft adapter
48.	2852	Oil pump spring
49.	2851	Spring guide
50.	2849-X	Oil pump assembly (individual pump parts not available)
51.	2798	Pump cover pin with 2848-X
51.	2848-X	Pump cover (includes pin)
52.	4225	Filter

Packing Assembly

ref no.	part no.	description	Qty
1.	2913-1	Cylinder	1
2.	2-235_a	O-ring for cylinder	2
3.	5000-137	retainer ring	2
4.	1012	Washer	2
5.	1628	Packing spring	2
6.	1714	Packing box washer	2
7.	1453-1	Male packing ring	2
8.	1454b	Packing	6
9.	1452-1	Female packing ring	2
10.	4398	Cartridge holddown screw	2
11.	4394	Packing box cartridge	2
12.	1387	Adjusting screw	2
13.	2-135_a	O-ring (packing cartridge)	2
14.	4393	Crosshead guide	1
15.	2702	Crankcase gasket	1
16.	1452-1X1	Packing set	2
17.	1651	Inspection plate gasket	1
18.	1650	Inspection plate	1
19.	7003- 025NC037E	1/4-20x3/8"	4
not shown	1192	Locking device	4

Other Assemblies

Assembly number	Assembly name	Qty
1132-X2	Crosshead assembly	2
1452-1X1	Packing set with 1452-1, 1453-1, 1454 (8), 1628, 1714	2

Other Assemblies

Assembly number	Assembly name
1279-X	breather cap assembly with 1279, 2-111A
1341-X1	Crankshaft assembly with 1284 (2), 1286, 1341, 1501, 2590, 2719
1342-X1a	Extended crankshaft assembly with 1284 (2), 1286, 1342, 1501, 2590, 2719
1368-X1	Oil bayonet assembly with 1368-X, 2-112A
1515-X	Closure cap assembly including 2-218A (2) (Spec 3, 4, 8, 9 only)
2956-X	bearing carrier assembly with 1285, 1290, 1291, 1292, 1293, 1515-X, 2718, 2805, 2806 (2), 2848-X, 2849-X, 2850, 2851, 2852, 2956, 2961-X, 2011-A, 2-112A, 2-228A.
2957-X	bearing cover assembly with 2957 and 1278
2961-X	Air release valve assembly with 2961, 2962, 2963
3271-X1a	Flywheel assembly, 14" O.d. 2 groove with 3218 and 3271 (not part of crankcase assembly) (not shown)