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You don't have to remove the engine, but replacing the cam involves removing the cylinder head to change the lifters, so it is a big job.
Besides getting quality parts, the most important step is the proper cam break in procedure and the continuing use of engine oil with ZDDP or using a ZDDP additive.
If you don't have one yet, get a repair manual. My 1st manual was a Haynes and it is easily available.
However, the Haynes got all its information from the original Volvo manuals and Volvos torque specification for the camshaft nut is too high. IIRC, there was a TSB revising the torque spec because the cams were breaking with the original spec.
Volvos original cam nut torque specification is 94-105 ftlbs. I use 75 ftlbs, some red Loctite and stake the nut.
My tips are to use an Elring head gasket set, update the front crankshaft seal to neoprene and to use a quality steel timing gear set if you have a fiber timing gear. I don't consider the Cloyes set as a quality steel timing gear set although it is a lot cheaper.
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Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com
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