Improved Camshafts, Rocker Arm Assemblies, and High-Pressure Oil Pumps Are Now Used on C27 and C32 Machine Engines {1123, 1210, 1304, 1315} Caterpillar

Improved Camshafts, Rocker Arm Assemblies, and High-Pressure Oil Pumps Are Now Used on C27 and C32 Machine Engines {1123, 1210, 1304, 1315}

Usage:

854K 221

Engine: C27 Engines; C32 Engines

Introduction

This Special Instruction provides information for the improved camshafts, rocker arms, and high-pressure oil pumps used on C27 and C32 Machine Engines.

C27 / C32 engine are defined as below:

1. C27 or C32 Engine with MEUI-A Injectors:

a. Engines built between 2005-2012 with MEUI-A injectors and/or engines built for legacy machines.

b. LRC (Lesser Regulated Country) engine: Current machines engine with emission rating equivalent to US EPA Tier 2 / 3 with MEUI-A Injectors.

2. C27 or C32 engine with MEUI-C Injectors: Current machine engine that meets US EPA Tier 4 Final.

Note: A factory engine build date will be required to understand appropriate changes for given engine. This date can be determined by entering engine serial number into Technical Marketing Information (TMI) web application.

Improved Rocker Arms

The new rocker arms have a radius roller.

The new rocker arms are direct replacement for former rocker arms. The new rocker arms are adaptable back to the first production on C27 and C32 Machine Engines.

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Illustration 1	g06405297
(1) Valve rocker arm (2) Roller (3) Groove around the roller

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Illustration 2	g06405324
(4) New valve roller groove (5) Former valve roller groove

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Table 1
New Reman Group	Former Reman Group	New Rocker Arm	Former Rocker Arm
20R-3319	10R-3483	437-3880	278-1363
20R-3323	10R-6098	437-3879	322-9168
20R-8517	20R-3328	526-1329	437-3870

The change is effective at the factory with engine build date of 01 March 2019.

The change is effective on Reman engines and long blocks built on or after 01 March 2019.

Note: Reman groups include adjusting screw and nut. The Reference New Assembly does not. Refer to Table 1 for a list of new and former Reman groups.

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Illustration 3	g06406961
Typical 384-1367 Valve Rocker Arm Visual reference chart for base level part identification (6) New oil path

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Illustration 4	g06406965
Visual reference chart for base level part identification The upper pictures directly below the part numbers show a cut away of the rocker arms, with or without, the oil paths. The lower pictures show the complete rocker arms for the same part numbers above. (7) Oil paths

Former rocker arms included various improvements, the addition of an oil hole for the cam roller outer surface, shown in Illustrations 4.

Note: Rocker arm with oil holes will require increased pressure.

DLC pins on rocker arms can be reused on new camshafts as long as the camshaft lobes and rollers do not exhibit any signs of scuffing, pitting or skidding failure:

1. DLC pins do not undergo break in due to the DLC pins high material hardness (previous generation bronze pin rocker arms underwent break-in and needed to be paired with camshaft, limiting the reusability).

2. DLC pins can adapt to any camshaft surface new or reused and DLC pins low friction joint with roller prevents camshaft scuffing and skidding.

DLC pins on rocker arms can be reused on new or old camshafts as long as the camshaft lobes and rollers do not exhibit any signs of scuffing, pitting, or skidding. Tracking lines are acceptable and do not indicate camshaft failure and should not affect DLC pin reusability.

Progression of Rocker Arms Groups

Refer to Table 2 for the progression of rocker arm part numbers.

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Table 2
Progression of Rocker Arm Group C27/C32 ACERT Engine
MEUI (Same for Brake and Non Brake)	Part Number Description	Nitride Cut Threads P/N	Non Nitrided Rolled Threads P/N	Isotropic Finish Injector P/N	Isotropic Finish Variable P/N	Forged Exhaust Rocker Arm P/N	Oil Hole Forged Rocker Arms P/N ⁽¹⁾	DLC and Oil Hole Forged Rocker Arms P/N ⁽¹⁾	DLC and Oil Hole Forged Rocker Arms P/N ⁽²⁾
MEUI A / LRC (Same for Brake and Non Brake)	Arm Gp - Valve Rocker	243-2468	280-8043	301-5349	320-2793	342-6643	392-0066	437-3876	437-3876
	Arm Gp - Unit Injector			301-5352	301-5352	301-5352	301-5352 10R-3483	437-3881 20R-3319	437-3881 20R-3319
	Injector Arm Assembly	243-2466	278-1363	278-1363	278-1363	278-1363	278-1363	437-3880	437-3880
	Injector Arm Part⁽³⁾	243-2465	274-5351	274-5351	274-5351	274-5351	274-5351	274-5351	274-5351
	Exhaust Arm Gp - Valve Rocker			301-5350	320-2794	320-2794	384-1365 20R-1897	437-3877 20R-3328	524-3708 20R-8517
	Exhaust Arm Assembly	259-6122	276-4132	301-5351	320-2795	320-2795	384-1366	437-3870	526-1329
	Intake Arm Gp - Valve rocker			301-5354	320-2796	320-2794	384-1365 20R-1897	437-3877 20R-3328	524-3708 20R-8517
	Intake Arm Assembly	203-8824	203-8824	301-5355	320-2797	320-2795	384-1366	437-3870	526-1329
	Intake Arm Part⁽³⁾	203-8823	203-8823	203-8823	203-8823	271-3962	384-1367	384-1367	384-1367
MEUI C Tier IV (Same for Brake and Non Brake)	Rocker Mechanical Gp				322-9000		322-9089	437-4420	437-4420
	Arm Gp - Unit Injector				322-9167		322-9167 10R-6098	437-3878 20R-3323	437-3878 20R-3323
	Injector Arm Assembly				322-9168		322-9168	437-3879	437-3879
	Injector Arm Part⁽³⁾				322-9169		322-9169	322-9169	322-9169
	Valve Gp				320-2794		384-1365 20R-1897	437–3877 20R-3328	524–3708 20R-8517
	Valve Arm Assembly				320-2795		384-1366	437-3870	526-1329
	Valve Arm Part⁽³⁾				271-3962		384-1367	384-1367	384-1367

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⁽¹⁾	Requires the application of higher pressure oil pumps. Refer to "Higher Pressure Oil Pumps" for more information.
⁽²⁾	The new replacement rocker arm assembly.
⁽³⁾	Injector rocker arm part number is not serviced at this level.

Higher Pressure Oil Pumps

Different springs and retainers in the new oil pumps increase the overall system oil pressure. This change is required when rocker arms with the additional oil hole are used.

The new pumps are adaptable back to the first production on all C27 and C32 engines.

The existing oil pumps can be updated by replacing the oil pump or the by-pass setting may be changed by installing the spring and/or retainer.

Use the following information to modify or replace the existing pumps.

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Table 3
To Replace the Existing Pump with the HP Oil Pump
New HP	Reman HP	Old	Old Reman
379-3989	20R-1516	116-1980	0R-8210
174-7916	20R-1512	7C-1772	0R-8804

Components required for updating the by-pass setting.

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Table 4
To Convert the Existing 116-1980 Engine Oil Pump Gp to the 379-3989 Engine Oil Pump Gp
New	Old	Description
(1) 236-6733	2S-2760	Spring
(2) 370-4611	122-9943	Retainer

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Illustration 5	g03123563
379-3989 Engine Oil Pump Gp (1) 236-6733 Spring (2) 370-4611 Retainer

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Table 5
To Convert the Existing 7C-1772 Engine Oil Pump Gp to the 174-7916 Engine Oil Pump Gp
New	Old	Description
(3) 9Y-1792	9Y-1800	Retainer

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Illustration 6	g03124377
174-7916 Engine Oil Pump Gp (3) 9Y-1792 Retainer

Existing oil supply and return hoses may need to be updated for applications that have a right-front oil filter location, refer to Table 7.

The D10T, the D11T, and the 993K do not require the oil supply and the return tubes to be updated.

Note: Refer to Illustrations 5 and 6 for a typical example of the new components and locations.

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Table 6
Remote Oil Filter Lines Gp
Lines Gp or Filter Gp	Old	New	Old	New
133-1892	248-3330 Tube As	388-4876 Hose As	248-3329 Tube As	388-4871 Hose As
225-9619	312-2019 Tube As	388-4876 Hose As	248-3329 Tube As	388-4871 Hose As
231-0211	248-3330 Tube As	388-4876 Hose As	248-3329 Tube As	388-4871 Hose As
316-5686	312-2019 Tube As	388-4876 Hose As	248-3329 Tube As	388-4871 Hose As

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Illustration 7	g03124577
Typical example (4) 388-4871 Hose As (Quantity 1) (5) 1P-4578 Half Flange (Quantity 8) (6) 398-6926 Bolt (Quantity 4) (7) 5P-8244 Hard Washer (Quantity 16) (8) 388-4876 Hose As (Quantity 1) (9) 6K-3771 Bolt (Quantity 12)

The change is effective on Reman engines built on or after 15 June 2013.

The change is effective at the factory with the engine serial number prefixes, by date, that are listed in Table 7.

Note: Table 7 provides effectivity for both the higher pressure oil pump and oil supply/return lines, when applicable.

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Table 7
LEGACY PRODUCT
Sales Model	Platform	Emissions	Machine Prefix	Engine Prefix	Oil Pump	Lines Gp
773F	C27	Tier 3	S/N:EED	S/N:EHX	15 February 2012	15 June 2012
773 OEM	C27	Tier 3	S/N:EXD	S/N:EHX	15 February 2012	15 June 2012
775F	C27	Tier 2	S/N:DLS	S/N:LJX	15 February 2012	15 June 2012
775F OEM	C27	Tier 2	S/N:EYG	S/N:LJX	15 February 2012	15 June 2012
777F	C32	Tier 2	S/N:JRP	S/N:LJW	15 February 2012	15 June 2012
777F OEM	C32	Tier 2	S/N:JXP	S/N:LJW	15 February 2012	15 June 2012
990	C27	Tier 3	S/N:BWX	S/N:EHX	15 February 2012	N/A
844K	C27	Tier 3	S/N:BTW	S/N:EHX	15 February 2012	N/A
992K	C32	Tier 2	S/N:H4C	S/N:LJW	15 February 2012	N/A
854K	C32	Tier 2	S/N:221	S/N:LJW	15 February 2012	N/A
993K	C32	Tier 2	S/N:Z4X, Z9K	S/N:LJW	15 February 2012	N/A
D10T	C27	Tier 3	S/N:RJG	S/N:EHX	15 February 2012	N/A
D11T	C32	Tier 2	S/N:GEB	S/N:LJW	15 February 2012	N/A
D11T CD	C32	Tier 2	S/N:TPB	S/N:LJW	15 February 2012	N/A
AD55B	C27	Tier 3	S/N:JNW	S/N:LJX	15 February 2012	N/A
OEM	C27	Tier 2	S/N:N/A	S/N:TWM	Not Required	N/A
OEM	C32	Tier 2	S/N:N/A	S/N:TLD	Not Required	N/A

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Table 8
LRC / MUEI-A PRODUCT
Sales Model	Platform	Emissions	Machine Prefix	Engine Prefix	Oil Pump	Lines Gp
773G	C27	LRC	S/N:MWH	S/N:PZB	17 April 2013	Not Required ⁽¹⁾
773G OEM	C27	LRC	S/N:T5S	S/N:PZB	17 April 2013	Not Required ⁽¹⁾
775G	C27	LRC	S/N:RFM	S/N:NZG	03 June 2013	Not Required ⁽¹⁾
775G OEM	C27	LRC	S/N:T5W	S/N:NZG	03 June 2013	Not Required ⁽¹⁾
777G	C32	LRC	S/N:TNM	S/N:FZS	15 February 2012	Not Required ⁽¹⁾
777G OEM	C32	LRC	S/N:T4Y	S/N:FZS	15 February 2012	Not Required ⁽¹⁾
990K	C27	LRC	S/N:DJK	S/N:NZT	8 May 2014	N/A
844K	C32	LRC	S/N:KLS	S/N:NZT	20 November 2012	N/A
992	C32	LRC	S/N:H9K	S/N:MZM	30 September 2011	N/A
854K	C32	LRC	S/N:ZMX	S/N:MZM	14 September 2011	N/A
993K	C32	LRC	S/N:Z4Z	S/N:NZK	24 August 2012	N/A
D10T	C27	LRC	S/N:RAB	S/N:JZM	26 November 2013	N/A
D11T	C32	LRC	S/N:AMA	S/N:WZH	04 August 2011	N/A
D11T CD	C32	LRC	S/N:MDG	S/N:WZH	11 August 2011	N/A
AD60	C27	Tier 2	S/N:KNW	S/N:LJX	20 March 2012	N/A
MD6240	C27	N/A	S/N:DN2, DR2, DT4	S/N:TWM	Not Required	N/A
MD6290	C27	N/A	S/N:DN3, DS3	S/N:TWM	Not Required	N/A
MD6420	C27	N/A	S/N:DN9, DR4, DT9	S/N:TWM	Not Required	N/A
MD6420C	C27	Tier 2	S/N:DN6	S/N:SG3	Not Required	N/A
6015B	C27	LRC (T1)	S/N:WSN	S/N:TZR	12 December 2013	N/A
6020B	C32	Tier 2	S/N:DNR	S/N:TZB	5 April 2012	N/A
6030 - 6030 FS	C27	Tier 2	S/N:DHL, DHG	S/N:TZD	14 November 2013	N/A
6040 - 6040 FS	C32	Tier 2	S/N:DHJ, DHX	S/N:TZB	Not Required	N/A

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⁽¹⁾	All design levels are compatible to higher pressure oil pump from first production of machine.

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Table 9
TIER 4 PRODUCT
Sales Model	Platform	Emissions	Machine Prefix	Engine Prefix	Oil Pump	Lines Gp
773G OEM	C27	Tier 4	S/N:T5T	S/N:PHB	15 February 2012	Not Required ⁽¹⁾
773G	C27	Tier 4	S/N:JWS	S/N:PHB	15 February 2012	Not Required ⁽¹⁾
			S/N:	Non-Brake S/N:PHB	16 April 2012	Not Required ⁽¹⁾
775G OEM	C27	Tier 4	S/N:T5F	S/N:NHG	15 February 2012	Not Required ⁽¹⁾
775G	C27	Tier 4	S/N:MJS	S/N:NHG	15 February 2012	Not Required ⁽¹⁾
				Non-Brake S/N:NHG	21 March 2013	Not Required ⁽¹⁾
777G OEM	C32	Tier 4	S/N:T5A	S/N:FHS	15 February 2012	Not Required ⁽¹⁾
777G	C32	Tier 4	S/N:RDR	S/N:FHS	15 February 2012	Not Required ⁽¹⁾
990K	C27	Tier 4	S/N:A9P	S/N:NHT	19 November 2012	N/A
844K	C27	Tier 4	S/N:MBE	S/N:NHT	15 February 2012	N/A
992K2	C32	Tier 4	S/N:880	S/N:MHM	30 September 2011	N/A
854K2	C32	Tier 4	S/N:H8M	S/N:MHM	14 October 2011	N/A
993X	C32	Tier 4	S/N:Z4D	S/N:NHK	09 August 2012	N/A
D10T	C27	Tier 4	S/N:JJW	S/N:JHM	11 February 2013	N/A
D11T	C32	Tier 4	S/N:JEL	S/N:WHH	05 August 2011	N/A
D11T CD	C32	Tier 4	S/N:JNS	S/N:WHH	19 August 2011	N/A
6015B	C27	Tier 4	S/N:LWN	S/N:THT	12 December 2013	N/A
6020B	C32	Flex (T2)	S/N:DNR	S/N:TZB	Not Built Yet	N/A
6030 - 6030 FS	C27	Flex	S/N:DHL, DHG	S/N:TZD	8 August 2013	N/A
6040 - 6040 FS	C32	Flex	S/N:DHJ, DHX	S/N:TZB	Not Required	N/A

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⁽¹⁾	All design levels are compatible to higher pressure oil pump from first production of machine.

Improved Camshafts

Exhaust and intake camshaft lobe profiles were improved by increasing the width of the lobes. This improvement provides a more uniform surface profile across width of the lobe.

Note: Some remanufactured camshafts with a former Reman part number may still utilize former design dimensions, and will not have a wider lobe. Improvements have already been introduced to achieve the same uniform profile as compared to new part numbers.

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Table 10
New Part Number	Former Part Number	New Reman Part Number	Former Reman Part Number
421-0049⁽¹⁾	301-7454	20R-1893	10R-6393
421-0071⁽²⁾	301-7457	20R-1894	10R-6394
421-0087⁽¹⁾	301-7455	20R-1895	10R-6395
421-0097⁽²⁾	301-7456	20R-1896	10R-6396
421-0155⁽¹⁾	375-8958	20R-2927	N/A
421-0176⁽²⁾	375-8959	20R-2928	N/A
421-0189⁽¹⁾	375-8960	20R-2929	N/A
421-0200⁽²⁾	375-8961	20R-2930	N/A
420-0455⁽¹⁾	375-8956	20R-2931	N/A
420-0456⁽²⁾	375-8957	20R-2932	N/A