| Volvo Engine >> REVISED CONNECTING ROD CAP SCREWS |
Revised Connecting Rod Cap Screws For
1991-98 Volvo 2.4L Code 57 Engines
The AERA Technical Committee offers the following information regarding a revised connecting rod cap screw for 1991-98 Volvo 2.4L Code 57 engines. This change occurred in the end of 1997 engine production and all 1998 engines have the revised cap screw.
A new screw for the engine connecting rod cap screw was introduced in model year 1998 for all S70/V70/C70 gasoline engines. The new screw has a closer pitch of thread. At the end of model year 1997 production approximately 800 engines were manufactured with this new type of screw. It is therefore important to check which type of screw the engine is equipped with if an engine from a model year 1997 car is being renovated, and whether the screw needs to be replaced. It is also possible older engine connecting rods have been placed into a 1997-98 engine.
When replacing the screw, it must be replaced with the same type of screw, in other words with the same pitch of thread. This bulletin describes how to spot the difference between the old and the new type of screw, and within which engine serial numbers mixed screw types are to be found.
Screw type Engine serial number Notes
Only older screws -1051765
Mixed old and new screws 1051766 - 1052536 A) see below
Only older screws 1052537 - 1059933
Mixed old and new screws 1059934 - 1059984 B) see below
Only new screws 1059985-
A) The following engines have Revised screw:
1051766-1051771, 1051778-1051783, 1051796-1051801, 1051814-1051819,
1051844-1052225, 1052240-1052245, 1052252-1052257, 1052264-1052269,
1052276-1052281, 1052288-1052293, 1052300-1052305, 1052312-1052317,
1052324-1052329, 1052336-1052341, 1052348-1052365, 1052384-1052389,
1052396-1052401, 1052420-1052425, 1052438-1052443, 1052462-1052467,
1052480-1052497, 1052504-1052536
B) The following engines have Revised screw:
1059934-1059935, 1059942-1059947, 1059954-1059959, 1059966-1059977
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