Description

Replacement Parts for Caterpillar® Engines

CAT DIESEL ENGINE PARTS LIST
CAT D342, CAT D343, CAT D346, CAT D348

Caterpillar D342/20.4L	6 Cylinder
Diesel	Bore 5.750
1246 CID	Stroke 8.000

CYLINDER KIT

6	LK9111-F	Cylinder kit	5.75Q bore, PC, straight rod, with plug, rect ring [4M9111 piston, 3S4Q31 rings, 7N98Q9 pin_r 7M4926 retainers, 8N5G76 liner, 5P9221 seal kit]
6	PLG7N1366	Cylinder kit	5.75Q bore, PC, straight rod, with plug, key ring [8N5G7G liner, 7N136G piston, 8N5760 rings, 7N9809 pin, 7M4926 retainers, 8N5676 liner]
6	4M9111-F	Piston body	5.75Q bore, PC, straight rod, with plug, rectangular ring; use with ring set 3S4031
6	7N1366	Piston body	5.750 bore, PC, straight rod, with plug, keystone ring
6	3S4031-F	Ring set	5.7500 bore, rectangular ring [1 cyl set]
6	8N5760	Ring set	5.75QQ bore, keystone ring [1 cyl set]
6	7N9809-F	Piston pin	2.3899 dia_r 4.726 length
12	7M4926	Retainer piston pin	use with 2.4QQ dia pin [repl 6B2291]
6	8N5676	Cylinder liner	5.75QQ bore, bare liner
6	5P9221	Cylinder liner oring kit	Contains:⑶ 6L7812,⑴ 8N4638
18	6L7812	Cylinder liner oring	Lower liner s抽I; c加tained in 5P9221 seal kit
6	8N4638	Cylinder liner oring	U卯er filler band; contained in 5P9221 seal kit

BEARINGS

	D339BRG	NOTE	3 styles of mains:⑴ 3.75CUft, 4.625 bore;⑵ 3.750 4.114 hsg bore,丨3) 4.261 4.625 hg bare

	D339BRG1	NOTE	Early main bearing set: 3.750 shaft, 4.625 housing bore
1	6F1931-F	Bearing main pair	Std_r rear; 3.7500 journal, 4.625 housing bore, 2.587 length
4	6F1932-F	Bearing main pair	Std_r 3.750 shaft, 4.625 housing
1	4H5510-F	Bearing thrust pair	Std, flanged; 3.75Q0 journaL 4.625 housing bore, 3.256 and 3.858 length
1	6H4510-F	Bearing main pair	Std; 3.7500 journal, 4.625 housing bore, 4.083 length
1	6H4498	Seal	Front, Std

1	2H2451-F	Bearing main pair	.025, rear
5	2H2449-F	Bearing main pair	■025, intermediate
1	4H5511-F	Bearing thrust pair	■025, center
1	7H4448-F	Bearing main pair	.025, front
1	7H6747-B	Seal	Front Oversize

1	6F1935-F	Bearing main pair	.Q5Q_f rear
5	6F1936-F	Bearing main pair	.050, intermediate
1	4H5512-F	Bearing thrust pair	■050, center
1	7H4449-F	Bearing main pair	.050, front
1	7H6747-B	Seal	Front, Oversize

	D339BRG2	NOTE	Mid main bearing set:: 3.750 shaft 4.114 housing bore
5	9M2429-B	Bearing main pair	Std_r Intermediate and Bear; 3.7500 journal, 4.114 housing bore, 1.780 length
1	9M2430-F	Bearing thrust pair	Std_r Center; 3.75QQ journal, 4.114 housing bore, 3.256 and 3.858 length
1	9M2431-F	Bearing main pair	Std_r Front; 3.7500 journal, 4.114 housing bore, 4.086 length
1	3S7569	Adapter	Std, Front
1	6H4498	Seal	Front, Std

5	1S7573-B	Bearing main pair	.Q25_f Intermediate and Rear
1	1S7574	Bearing thrust pair	.025, Center
1	1S7575-F	Bearing main pair	.025, Front
1	4S5358	Adapter	Front, Oversize
1	7H6747-B	Seal	Front, Oversize

5	1S7576	Bearing main pair	.Q5Q_f Intermediate and Rear

Caterpillar		D342/20.4L		6 Cylinder
Diesel		(Continued)		Bore 5.750
1246 CID				Stroke 8.000
1	1S7577	Bearing thrust pair	.050_# Center
1	1S7578	Bearing main pair	.050, Front
1	4S5358	Adapter	Front, Oversize
1	7H6747-B	Seal	Front, Oversize

	D339BRG3	NOTE	Late main bearing set: 4.261 shaft, 4.625 housing bore
6	8N7923	Bearing main pair	Std; Front, Intermediate, Rear; 4.2610 joumal, 4.6250 housing bare, 1.78Q length [repl 4S6581]
1	8N7928	Bearing thrust pair	Std; Center; 4.2610 journal, 4.6250 housing bare, 3.248 and 3.858 length [repl 4S6582]

6	8N7924	Bearing main pair	.025; Front, Intermediate, Rear [repl 4S9396]
1	8N7929	Bearing thrust pair	.025; Center [repl 4S9397]

6	8N7925-F	Bearing main pair	.050; Front, Intermediate, Rear [repl 4S9398]
1	8N7930-F	Bearing thrust pair	.050; Center [repl 4S9399]

6	2M6499	Bearing rod pair	Std, 3.6250 journal, 3.967Q housing bore, 2.563 length
Eariy, Mid
6	2M6500-B	Bearing rod pair	■025
6	2M6501-B	Bearing rod pair	■050

6	8N7933	Bearing rod pair	Std; 3.6250 journal, 3.9G7Q housing bore, 2.000 length
Late
6	8N793310-F	Bearing rod pair	■010
6	8N7934	Bearing rod pair	■025
6	8N7935-F	Bearing rod pair	■050

3	8F8523	Bearing cam	2.010 0AL
2	4H9640	Bearing cam	1.200 0AL

6	4M9183	Bushing con rod	2.380 ID, 2.617 00, 2.06 OAL
6	1599X	Bushing con rod	[Discontinued] 2.350 ID, 2.687 0D, 2.067 QAL; Full round bushing; use with rod 7B6225, 7B6625
GASKET & SEALS
	CATGASKET	NOTE	For gasket sets: Call with Serial and Arrangement Numbers
CAMSHAFT
	1W3176	Camshaft	[OEM] (9Y3230 cam kit) Call for price and availability of remanufactured
	5S1220-B	Litter
VALVE TRAIN
	CYLHEAD	NOTE	For complete and bare cvlinder heads – Refer to Cylinder Head Catalog or Call with casting
	D339HEAD1	EARLY HEAD	Tapered groove valve stem with Q.4955 dia and 3 locks each, flanged guide
6	8H1993	Valve intake	2.343 head dia, 9.297 0AL_# 0.4955 stem dia, tapered groove [repl 7F5310]
6	8H1994	Valve exhaust	2.282 head dia, 9.266 length, Q.4955 stem dia, tapered groove [repl 7F4784, 5F8365, 1H9292]
12	4F5409-F	Valve spring	Inner, 1.145 0D_# 2.359 free
12	4F5408-F	Valve spring	Outer, 1.641 00,2.421 free
6	2S0893-B	Valve guide	Intake, flanged; for 0.4955 stem dia [repl 6F5263]
6	1S6654-B	Valve guide	Exhaust, flanged; for 0.4955 stem dia
36	3B1143	Valve lock	No bead, for tapered valve stem, for 0.4995 stem
12	7F7666-B	Rotator
	D339HEAD2	MID HEAD	Tapered groove valve stem with Q.4955 dia and 3 locks each, nan-flanged guide
6	8H1993	Valve intake	2.343 head dia, 9.297 DAL_# 0.4955 stem dia, tapered groove [repl 7F5310]
6	8H1994	Valve exhaust	2.282 head dia, 9.266 length, 0.4955 stem dia_f tapered groove [repl 7F4784,5F8365,1H9292]
12	9M5349	Valve spring	Inner, 1.125 0D_# 2.201 free

Caterpillar D342/20.4L				6 Cylinder
Diesel (Continued)				Bore 5.750
1246 CID				Stroke 8.000
12	9M5350	Valve spring	Outer, 1.654 0D, 2.574 free
12	7N2051	Valve guide	Both, non-flanged; for 0.4955 stem dia; use with 3N1414 spacer
12	3N1414	Spacer	Use with non-flanged guide
36	3B1143	Valve lock	No bead, for tapered valve stem, for 0.4995 stem
12	7N7639	Rotator	[repl 8M7637_f4S7468]
	D339HEAD3	LATE HEAD	Two groove valve stem with 0.3717 dia and 2 locks each, non-flanged guide
6	1W1818	Valve intake	2.343 head dia_r 9.297 0AL_f 0.3717 stem dia_r 45 deg_r 2G
6	1W1819	Valve exhaust	2.282 head dia_r 9.266 length, 0.3717T stem dia_r 45 deg_r 2G
12	9M5349	Valve spring	Inner, 1.125 0D_f 2.201 free
12	9M5350	Valve spring	Outer, 1.654 QD_r 2.574 free
12	1W1816	Valve guide	Both, non-flanged; for 0.3717 stem dia; use with 3N1414 spacer
12	3N1414	Spacer	Use with non-flanged guide
24	2A4429	Valve lock	0.372 stem dia, 2G_r 7 degree
12	7N7639	Rotator	[repl 8M7637_r4S7468]
FUEL I INJECTOR
6	8N1831-F	Nozzle	Capsule nozzle (repl 7S1059)
Tm^OIAIR
	TURBO	TURBOCHARGER	New or remanufactured available, call for pricing

Caterpillar G342/20.4L	6 Cylinder
Gas	Bore 5.750
1246 CID, Natural Gas	Stroke 8.000

CYLINDER KIT

6	PLG7M3681	Cylinder kit	7.5:1 CR
6	PLG7M3680	Cylinder kit	10.5:1 CR

6	7M3681	Piston body	7.5:1 CR
6	7M3680	Piston body	10.5:1 CR

6	7N9809	Piston pin	2.3899 dia_r 4.726 length
	7M4926	Retainer piston pin	use with 2.4QQ dia pin [repl 6B2291]
了	3S4058	Ring set

6	8N5676	Cylinder liner	5.75QQ bore, bare liner
了	5P9221	Cylinder liner oring kit	Cd_ins:⑶ 6L7812, (1) &N4638

BEARINGS

	D339BRG	NOTE	3 styles of mains:⑴ 3.750 Sft, 4.625 hsg bdre;⑵ 3.750 Sft, 4.114 hsg bore,⑶ 4.26Uft, 4.625 hg bore

	D339BRG1	NOTE	Early main bearing set: 3.750 shaft, 4.625 hausing bore
71B1-536
1	6F1931	Bearing main pair	Std
4	6F1932	Bearing main pair	Std
1	4H5510	Bearing thrust pair	Std
1	6H4510	Bearing main pair	Std

1	2H2451	Bearing main pair	■025″
4	2H2449	Bearing main pair	■025″
1	4H5511	Bearing thrust pair	■025″
1	7H4448	Bearing main pair	.025^H

1	6F1935	Bearing main pair	■050″
4	6F1936	Bearing main pair	■050″
丁	4H5512	Bearing thrust pair	■050″
丁	7H4449	Bearing main pair	■050^H

r	D339BRG2	NOTE	Mid main bearing set:: 3.750 shaft, 4.114 housing bore
71B537-749
5	9M2429	Bearing main pair	Std
丁	9M2430	Bearing thrust pair
丁	9M2431	Bearing main pair

5	1S7573	Bearing main pair	■025″
丁	1S7574	Bearing main pair	■025″
丁	1S7575	Bearing main pair	■025″

5	1S7576	Bearing main pair	■050″
丁	1S7577	Bearing main pair	■050″
丁	1S7578	Bearing main pair	■050″
	D339BRG3	NOTE	Late main bearing set: 4.261 shaft, 4.625 housing bore
71B750-Up
6	8N7923	Bearing main pair	Std; Front, Intermediate, Rear; 4.2610 journal, 4.6250 housing bare, 1.78Q length [repl 4S6581]
丁	8N7928	Bearing thrust pair	Std; Center; 4.2610 journal, 4.6250 housing bore, 3.248 and 3.858 length [repl 4S6582]

Caterpillar	G342/20.4L		6 Cylinder
Gas	(Continued)		Bore 5.750
1246 CID, Natural Gas			Stroke 8.000
6 8N7924	Bearing main pair	.025; Front, Intermediate, Rear [repl 4S9396]
1 8N7929	Bearing thrust pair	.025; Center [repl 4S9397]

6 8N7925	Bearing main pair	■05(r
1 8N7930	Bearing main pair	■050″

6 2M6499	Bearing rod pair	Std, 3.6250 journal, 3.967Q housing bore, 2.563 length
71B1-749
6 2M6500	Bearing rod pair	.025^H
6 2M6501	Bearing rod pair	■050^H

6 8N7933	Bearing rod pair	Sfd; 3.6250 journal, 3.967D housing bore, 2.000 length
71B750-Up
6 8N7934	Bearing rod pair	■025
6 8N7935	Bearing rod pair	.Q5Q; Partial grove; 2.000 0AL

2 4H9640	Bearing cam	1.200 0AL
3 8F8523	Bearing cam	2.010 0AL

1 6H4498	Seal	Front, Std
71B1-749
6 4M9183	Bushing con rod	2.380 ID, 2.617 0D_f 2.06 0AL
2 4H9640	Bearing cam	1.200 0AL
GASKET & SEALS
1 342071	Set overhaul	Non spacer plated block
1 342081	Set overhaul	Spacer plated block

1 342072	Set inframe	Non spacer plated block
1 342082	Set inframe	Spacer plated block, composite head gasket

1 342073	Set cylinder head	Multiple, Non spacer plated block
1 342083	Set cylinder head	Multiple, Spacer plated block

1 7N9352	Gasket valve cover
1 2P3759	Gasket oil pan
1 8H7319	Seal crankshaft front
71B1-749
1 2S1509	Seal crankshaft front
71B750-Up
1 9N2539	Seal crankshaft front
71B750 -Up Oversize Use With 9JQ110
1 9J0110	Sleeve front
71B 750- Up Use With 9N2539
1 2W2191	Seal crankshaft rear	Piston ring type
71B750-Up
CAMSHAFT
6 5S1220	Lifter
12 1A0744	Screw rocker arm adj
12 1B4204	Nut	Rocker arm adjusting
12 3F7445	Bushing rocker arm
VALVE TRAIN		I
CYLHEAD	NOTE	For complete and bare cylinder heads – Refer to Cylinder Head Catalog or Call with casting

Caterpillar G342/20.4L				6 Cylinder
Gas (Continued)				Bore 5.750
1246 CID, Natural Gas				Stroke 8.000

D339HEAD4
Head using 3/8″ stem valves
6	1W1819	Valve exhaust	2.282 head dia, 9.266 length, 0.3717T stem dia, 45 deg, 2G
6	1W1818	Valve intake	2.343 head dia, 9.297 0AL_# 0.3717 stem dia, 45 deg, 2G
12	9M5349	Valve spring	Inner, 1.125 0D_# 2.201 free
12	9M5350	Valve spring	Outer, 1.654 0D_f 2.574 free
12	1W1816	Valve guide	Both, non-flanged; for 0.3717 stem dia; use with 3N1414 spacer
24	2A4429	Valve lock	0.372 stem dia, 2G, 7 degree
12	7N7639	Rotator	[rep( 8M7637_r4S7468]
12	2N9297	Retainer	Exhaust
12	3N1414	Spacer	Use with non-flanged guide
6	8M9810	Valve insert	Exhaust
6	9M8745	Valve insert	Intake

28	3B0623	Plug
2	5M6214	Plug

D339HEAD5
Head using 1/2″ stem valves
6	8H1993	Valve intake	2.343 head dia, 9.297 QAL_# 0.4955 stem dia, tapered groove [repl 7F5310]
6	8H1994	Valve exhaust	2.282 head dia, 9.266 length, 0.4955 stem dia, tapered groove [repl 7F4784,5F8365, 1H9292]
12	9M5349	Valve spring	Inner, 1.125 0D_# 2.201 free
12	9M5350	Valve spring	Outer, 1.654 0D_f 2.574 free
12	7N2051	Valve guide	Both, non-flanged; for 0.4955 stem dia; use with 3N1414 spacer
36	3B1143	Valve lock	No bead, for tapered valve stem, for 0.4995 stem
12	7N7639	Rotator	[repl 8M7637,4S7468]
12	3B1142	Retainer
12	3N1414	Spacer	Use with non-flanged guide
6	8M9810	Valve insert	Exhaust
6	9M8745	Valve insert	Intake
4	3B0622	Plug

6	7L0917	Spark plug adapter
6	6L1576	Gasket spark plug adp	Metal gasket
6	6L7816	Seal spark plug adp
71B495-Up
6	6B7021	Seal spark plug adp
71B1-494
24	5H7071	Water director
CRANKSHAFT
1	3S7569	Adapter crankshaft seal	Rear
71B1-749
1	4S7793	Thrower crankshaft	Rear
71B750-Up
1	1S8607	Baffle crankshaft	Rear
71B750-Up
COOLING SYSTEM			I
²	9S3808	Thermostat	170F degree
71B1-220
²	6I4954	Thermostat	170F degree

71B221-378

Caterpillar G342/20.4L				6 Cylinder
Gas (Continued)				Bore 5.750
1246 CID, Natural Gas				Stroke 8.000
2	4W4794	Thermostat	Used with 7W8066 water lines group only, 180 degree [new# 2477133]
71B379-Up
1	6V4553	Set water pump
71B1-233Q
1	5P9241	Set water pump
71B2331-Up

1	1W7035	Kit water pump rebuild
1	IPD7035	Kit water pump overhaul

1	4N7526	Seal assembly
71B1-2330
1	6N9313	Seal assembly
71B2331 -Up
1	6L6459	Shaft water pump	Fresh water pump
1	3S3535	Seal rubber	Use with 2S3966
1	2S3966	Ring	Use with 4N7526
8	5H4342	Washer
1	4H9836	Seal rubber
1	4H8891	Gasket
1	4H8890	Gasket
1	1B4116	Bearing water pump
1	3L7685	Lock
1	2A0053	Nut

BLOCK

1 8N6150	Insert block	Stainless steel .060″
1 8N6742	Insert block	Stainless steel .125″
1 5P6595	Sleeve block	ⁿT stepped
1 5P65950/S	Sleeve block	“2” stepped, .015 oversize

Caterpillar D343/1693/14.6L	6 Cylinder
Diesel	Bore 5.400
893 CID	Stroke 6.500

CYLINDER KIT

6	PLG9N2874	Cylinder kit	5.4QQ bore, 2.00 pin, PC [9N2874 piston, 8N0822 rings, 7N9806 pin, 3F8513 retainers, 1260739 liner]
Replaces LK0735 cylinder kit in sets
6	LK0735-F	Cylinder kit	5.4QQQ bore, PC, 2.000 pin, straight rod, dual ni, 1/4 oil ring [7N0735 piston, 1PQ734 rings, 7N9806 pin,
			7E5G65 retainers, 1260739 liner, 5P8789 seal kit]
6	9N2874	Piston body	5.4QQ bore, 2.00 pin, PC, straight rod, 4 valve relief with plug, 1/8 oil ring
Replaces 7NQ735 piston in sets
6	7N0735-F	Piston body	5.4QQQ bore, 2.QQ pin, PC, straight rod, early type piston L/F, dual-ni, 1 /4 oil ring groove
6	8N0822	Ring set	1/8 keystone top ring [8N0502 top, 2P2817 mid, 7N7078 oil] 1 cyl set
Used with 9N2874 piston body
6	1P0734-F	Ring set	5.4000 bore, 1 /4 oil ring [1 cyl set]
Used with 7N0735 piston body
6	7N9806	Piston pin	2.000 dia, 4.525 length {straight and narrow taper rod)
12	3F8513	Retiner piston pin
Used with 9N2874 piston body
12	7E5665	Retainer piston pin	Use with 2.QQQ pin diameter [repl 8N7295]
Used with 7N0735 piston body
6	1260739	Cylinder liner	5.4QQQ bore [uses (3) 3S3978, (1) 9L5854 seals] [repl 6M8700]
6	5P8789	Cylinder liner oring kit	Contains: (3) 3S3978, (D9L5854
18	3S3978	Cylinder liner oring
6	9L5854	Cylinder liner oring	Upper band seal, 1 per liner

BEARINGS

6	7W2138	Bearing main pair	Std, 4.500 journal, 4.88GQ housing bore, 1.500 length
6	8N5346	Bearing main pair	■025
6	8N5347	Bearing main pair	■050

1	7W2137	Bearing thrust pair	Std_f 4.500 journal 4.8860 housing bore, 1.500 and 2.088 length
1	8N5341	Bearing thrust pair	.025
1	8N5342	Bearing thrust pair	■050

6	7W2136	Bearing rod pair	Std, 3.540 journal, 3.85GQ housing bore, 1.776 length
6	8N5339	Bearing rod pair	■025
6	8N5338	Bearing rod pair	.050

12	5M3560	Bearing cam	2.885 shaft, 3.127 OD, 0.744 OAL
2	5M3603	Bearing cam	1.878 shaft, 2.127 0D_# 0.720 OAL

6	1M6107	Bushing con rod	2.001 ID, 2.183 0D, 1.875 OAL
GASKET & SEALS
	CATGASKET	NOTE	For gasket sets: Call with Serial and Arrangement Numbers
CAMSHAFT
	CAMSHAFT	CAMSHAFT	Remanufactured available, call with casting number
VALVE TRAIN
	CYLHEAD	NOTE	For complete and bare cylinder heads – Refer to Cylinder Head Catalog or Call with casting
12	1N4885	Valve intake	1.771 head dia, 5.997 OAL [repl 1P0407]
12	7E7830	Valve exhaust	1.646 head dia, 5.997 length [repl 1P1081]
48	2A4429	Valve lock	0.372 stem dia, 2G_r 7 degree
24	6N2236	Valve guide	[repl 2N3293]
24	2S4213	Valve spring
24	4N6761	Rotator
12	9M3205	Insert intake
12	1W5283	Valve insert	Exhaust, IPD standard size 1.692″

Caterpillar Diesel 893 CID	D343/1693/14.6L (Continued)		6 Cylinder Bore 5.400 Stroke 6.500
FUEL \| INJECTOR
6 8N1831-F	Nozzle	Capsule nozzle (repl 7S1059)
6 8N3176-F	Nozzle	Capsule nozzle (repl 7M4190)
TUI^OIAIR		l
TURBO	TURBOCHARGER	New or remanufactured available, call for pricing

Cat engine parts7

Description

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