On which studs, between which layers did the rubber oil galley seal cylinder things go again?

[asdfqwer426]

Had my 350 for about 18 years now (can't believe it's been that long!). Rebuilt the top end after a major issue about 14 years ago but for the last 7 years it hasn't run quite right and has mostly been parked in the garage. I always assumed since I had redone the engine not that many miles ago, it was fine, and I looked at EVERYTHING else. So many times. year after year. This summer I really dug into my bikes again and I finally spotted a puff of smoke coming out the side of the engine. Bad head gasket sure seemed to fit the symptoms it's had so I pulled the engine, took apart the top end, and started to clean engine parts to reassemble with new gaskets.

Issue is, I can't seem to find exactly on which studs and between which layers of the engine the two oil galley cylinder seal things are supposed to sit. Any help would be appreciated!

https://imgur.com/LbWeQNt

 

[LongDistanceRider]

There are no seals there. The head gasket is the only sealing. You might add a VERY thin smear of Honda Bond around the galley hole BUT be sure it's not enough to squeeze into the galley.

 

[asdfqwer426]

It's been years since I learned this stuff, but I can't seem to recall what these two rubber cylinders are for then?

https://imgur.com/2DJDdtZ

Was it something to do with the early model 350s? I remember them being in my kits years ago as well and thought I remembered they were supposed to go on a stud between two engine top end parts.

 

[ancientdad]

It's been years since I learned this stuff, but I can't seem to recall what these two rubber cylinders are for then?

Was it something to do with the early model 350s? I remember them being in my kits years ago as well and thought I remembered they were supposed to go on a stud between two engine top end parts.

It's for the DOHC 450 and 500T. Most gasket sets today have a bunch of o-rings in them that don't fit, along with (usually) the ones required.

 

[Boomer343]

I have a selection of those in my throw away one day bag of rubber pieces. No valve seals for the 350 either.

Watch the o-rings that go on the bottom of the cylinders as some kits include ones that are too thick. Be sure to clean the grooves before installing new ones.

On my builds I use copper coat spray on all gasket surfaces other than side covers.

I also use light oil on the cylinder stud threads and torque to 16 ft/lbs.

 

[asdfqwer426]

It's for the DOHC 450 and 500T. Most gasket sets today have a bunch of o-rings in them that don't fit, along with (usually) the ones required.

Ah! that's probably what's confusing me, having rebuilt my 500T at about the same time as my 350 years ago. Thanks for the clarification!

I have a selection of those in my throw away one day bag of rubber pieces. No valve seals for the 350 either.

Watch the o-rings that go on the bottom of the cylinders as some kits include ones that are too thick. Be sure to clean the grooves before installing new ones.

On my builds I use copper coat spray on all gasket surfaces other than side covers.

I also use light oil on the cylinder stud threads and torque to 16 ft/lbs.

I just cleaned those grooves out in the last half hour actually! I'll look out for the o-ring size, thanks!

unfortunately I'll be waiting on one of those little cam chain roller rubber half moon kind of pieces before buttoning it back up. There's one on ebay that just happens to be in the next town over, hoping I can pickup instead of having to wait for shipping.