Evo oil pump failure - what to do?
#11
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Isn't gear 25 here the plastic breather gear that a lot of people talk about replacing on these engines? Interesting. Excited to see the stuff I've just been reading about.
#12
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No, 25 in the diagram is the oil pump shaft driven gear, which is driven by the pinion gear that is on the pinion shaft of the wheels (crank shaft) the breather gear is in the cam chest and is timed with the cam.. Let us know when you pull the cam chest apart and take a lot of pictures but it's starting to sound like cam bearing failure... Don't run it any more.
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Last edited by 98hotrodfatboy; 10-16-2021 at 12:24 PM.
#13
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Two things on the photos - the cam cover gasket is for a '93-up on a '92 and earlier engine case. Top breather vs bottom breather so don't get the 2 confused. Second, the oil pump diagram is for a '91-up Softail and the cover (15) is different from a '90. Otherwise, except for a very slight bolt pattern change in '92, the oil pump internals are all the same.
But from your recent information, besides correcting whatever fouled the oil pump, I'd say at the very least a top end rebuild, is probably where you need to have your thoughts.
But from your recent information, besides correcting whatever fouled the oil pump, I'd say at the very least a top end rebuild, is probably where you need to have your thoughts.
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TwiZted Biker (10-17-2021)
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