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305 oil leak

cphillips
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Posts: 33
Joined: Sat Oct 16, 2010 10:39 am
Location: Seaford, DE USA

305 oil leak

Post by cphillips » Sat Oct 16, 2010 10:44 am

After I reassembled a 1964 305 engine in the dream I was restoring, as soon as I put oil in the engine, it began leaking profusely out of the round cover where the oil filter is. I replaced the o-ring with one out of an engine that I know didn't leak but it leaked in this engine too. Then I tried a new o-ring and that didn't work so then I tried rtv plus a new o-ring and it still leaks just as bad. I was thinking that it may be leaking around the three screws that hold it one. Any help would be apprediated.
Thanks, Cole

LOUD MOUSE
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Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: 305 oil leak

Post by LOUD MOUSE » Sat Oct 16, 2010 1:43 pm

2 "O" rings in there. ...........lm
cphillips wrote:After I reassembled a 1964 305 engine in the dream I was restoring, as soon as I put oil in the engine, it began leaking profusely out of the round cover where the oil filter is. I replaced the o-ring with one out of an engine that I know didn't leak but it leaked in this engine too. Then I tried a new o-ring and that didn't work so then I tried rtv plus a new o-ring and it still leaks just as bad. I was thinking that it may be leaking around the three screws that hold it one. Any help would be apprediated.
Thanks, Cole

cphillips
honda305.com Member
Posts: 33
Joined: Sat Oct 16, 2010 10:39 am
Location: Seaford, DE USA

oil leak

Post by cphillips » Sat Oct 16, 2010 7:28 pm

Yes I replaced both o-rings to no avail. Is there any way to seal the screws because that is where I think that it is leaking.

LOUD MOUSE
honda305.com Member
Posts: 7817
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: oil leak

Post by LOUD MOUSE » Sat Oct 16, 2010 8:23 pm

I'd say if the leak is at the screws ya need to find out how as I've never seen that. ..........lm
cphillips wrote:Yes I replaced both o-rings to no avail. Is there any way to seal the screws because that is where I think that it is leaking.

cknight
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Joined: Wed Apr 05, 2006 3:55 pm
Location: Daytona Beach, FL

Post by cknight » Sun Oct 17, 2010 9:44 am

Assuming that you have the later type case and cover with the larger access hole, the two o-rings are different. If you use the same 3mm cross section o-rings in both positions, you will have a pronounced oil leak from under the cover. For the outboard position, a 74.5 X 8mm o-ring is required. Regards, Chase

cphillips
honda305.com Member
Posts: 33
Joined: Sat Oct 16, 2010 10:39 am
Location: Seaford, DE USA

Post by cphillips » Sun Oct 17, 2010 3:29 pm

I am not sure what size the o-rings were as they came as part of a gasket set but I will buy the size you suggested and try it. Thanks for letting me know.

cphillips
honda305.com Member
Posts: 33
Joined: Sat Oct 16, 2010 10:39 am
Location: Seaford, DE USA

Post by cphillips » Sun Oct 17, 2010 6:42 pm

Does anybody know where I can find a 74.5x8mm o-ring?
Thanks, Cole

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