The end of the filter with the 5/8" hole in it goes toward the crankcase over the little round spigot cast into the crankcase. The small o ring fits over that spigot between the filter and the crankcase.

The side of the filter that faces the cover is closed. The spring fits in the recess on that end of the filter and presses up against the cover to keep the filter pushed onto the crankcase spigot when everything is buttoned up.

If the filter is installed backwards the hole from the crankcase is blocked and oil cant flow into the center of the filter and out through the pleats into the cavity created by the cover.

Bob,
I think my old parts engine is still closed up on the oil cover. If it is, I will open it up tonight and snap some current pics for you on these parts, the order, and what NOT to do. It is super easy to get the filter swapped 180 if you turn your head away for a second.

Bokobob wrote on 04/09/20 at 06:01:30:




Where are you doing that ? My firnds at Gaston Motorcycle shop ???
If you go there, give Peavey a slap in the face and tell him the Injun called paaco says hi.
Cool.
Srinath.

Ok...so here are all the bits inside there.

Not counting the engine case, the order they go in are:
(a) Little o-ring (sitting on the oil filter) goes over the engine oil port hole.
(b) Oil filter with the OPEN HOLE SIDE FACING IN goes on the oil port hole snug to the little o-ring.
(c) Large o-ring (goes on the oil filter cover in the obvious recess).
(d) Spring (keep this on the cover when reinstalling and push the cover and spring on simultaneously).
(e) Oil filter cover.

Pretty simple, but very easy to get that filter in backwards. When putting on the cover, push the spring onto the cover and apply gentle pressure as you make contact with the oil filter, then wiggle it slightly while holding light pressure to make sure that the spring sits into the recess on the outward side of the oil filter.

That's it!  

Outward facing side (no hole, but recess for spring)

Doesn't the stock filter have a pressure relief type valve in it's center? I'm not sure but I think it has.
   It's a long shot but maybe this happened, If you ran heavy weight oil with a used filter for 200 miles which partially plugged up the filter then had the relief valve not work during a cold startup the extra pressure from the plugged filter and thick cold oil would have to go somewhere and popped the cover like a pimple.
  Just a thought, wish I could describe it better. Hope the engine is OK.

Ed L. wrote on 04/09/20 at 19:43:50:


When mounted properly, I believe the spring allows the filter to move outwards and bypass the filter - without blowing out the aluminum cover.

This sure looks like the classic explosion that happens when the filter is installed backwards......there really is no other logical explanation.

Bokobob wrote on 04/09/20 at 17:12:36:




Gaston motorcycle shop is on new hope road by the school on the road that cuts through cramer mountain.
They're a pop (Andy) and nephew (Peavey) shop. Really good, but very very old school shop and yard. Peavey just talks too much.

Old fashioned junkyard - where you can go through the yard looking for parts too. I got my dirt bike FE's to slap on my cheater chopper there.

Cool.
Srinath.