2 knock pins on base gasket

Geeky160 · Post by **Geeky160** » Sun Aug 24, 2014 6:53 am

Hi, I tried to figure this out from the shop manual and Bill's guide but couldn't. I was reassembling my 305 engine with two knock pins at the cylinder base. It seems like the cylinder doesn't want to seat over one side (right) with the pin in place.

Since I have a donor engine, I was thinking I mistakenly grabbed one from the other engine. It slides down fine without the pin on that side. Is that knock pin mandatory or can I leave that side out? Thanks

Waveblaster · Post by **Waveblaster** » Sun Aug 24, 2014 7:53 am

do you have access to a vernier caliper to measure locating pin length / width and corresponding depth of the two recesses

Geeky160 · Post by **Geeky160** » Sun Aug 24, 2014 10:20 am

Good news, I cleaned up the hole and was able to seat the knock pin. I'm assuming the prior rebuilder left it out resulting in some kind of buildup. Thanks

abert51 · Post by **abert51** » Tue Aug 26, 2014 9:16 am

just FYI, the knock pins are crucial. They not only locate the head BUT serve as seating sights for the two little rubber o-rings that seal these two critical oil passages,... i.e. oil from the bottom end to the rockers and cams. best of luck.

48lesco · Post by **48lesco** » Tue Aug 26, 2014 3:31 pm

I think the knock pins he is referring to are the ones between the crankcase and cylinder base and those are just blind holes.
-48

Geeky160 · Post by **Geeky160** » Tue Aug 26, 2014 4:41 pm

Yes, I was asking about the knock pins at the base gasket. I didn't see any orings there. thanks