Piston Broke Posted May 1, 2023 Share Posted May 1, 2023 I've stripped down the oil pump on my WOF engined (having trashed the drive gear driving out the cotter pin. It sounded so simple in the manual!). I find that it's innards are different to the original MB version covered in the manual; has a four spur rotor, same as an M38 I believe. Can anyone direct me to a site or manual that will show the acceptable clearances and tolerances for this model, so I can check before re-assembly? I also see an oil drain pipe from the rear main bearing shown in the original MB parts diagram. This is missing on my engine, just a hole. Can anyone confirm that this is correct for the later engine? Quote Link to comment Share on other sites More sharing options...
Jessie The Jeep Posted May 1, 2023 Share Posted May 1, 2023 (edited) Not sure about the oil pump tolerances, but having a missing pipe on the rear bearing is apparently ok. I was having a problem with a leaking rear oil seal and Cliff at Universal Jeep Parts said later engines omitted the pipe and told me it was ok to remove the pipe on mine. This increases the hole from about 3/8in of the original pipe to about 1/2in opening, allowing the oil to flow more freely, reducing pressure on the rear oil seal. Edited May 1, 2023 by Jessie The Jeep Quote Link to comment Share on other sites More sharing options...
Piston Broke Posted May 2, 2023 Author Share Posted May 2, 2023 Thanks for that. One question answered, just the oil pump to go (until the next problem!). Quote Link to comment Share on other sites More sharing options...
Piston Broke Posted May 3, 2023 Author Share Posted May 3, 2023 Having located a replacement drive gear for the pump, I need a replacement shear pin to hold it onto the pump shaft. Does anyone know a source, to save me trawling all the local engineering firms? Quote Link to comment Share on other sites More sharing options...
Piston Broke Posted May 3, 2023 Author Share Posted May 3, 2023 Regarding my original question about oil pump tolerances etc., I found this M38 manual online http://jeepwillysworld.com/wp-content/uploads/2016/05/M38-Engine.Clutch.pdf which contains all the necessary info should anyone else find themselves needing it. Thanks to whoever who did the original upload! Still need a shear pin for the pump drive gear though, if anyone knows of a source. Quote Link to comment Share on other sites More sharing options...
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