Oil leaking from rocker assembly - Honda ATV Forum
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post #1 of 3 (permalink) Old 05-13-2019, 06:26 PM Thread Starter
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(My ATV is a 1986 Honda TRX 350)

There had been some oil on the cylinder head fins which I thought was coming from the valve cover seal which I replaced a while ago but never cleaned up the oil. Today I took some brake clean and compressed air to clean it up which worked really well but when I drove it home I noted that some oil was leaking out around bolts going into the rocker assembly. I think it may be the O-rings but not sure. If it is the O-ring what would be the easiest way to fix it without pulling the motor or is it even possible? And would it cause any damage if I leave the slow leak alone and top up the oil ever once and a while?

I think the O-Ring (18) that fits around the rocker arm (7 & 6) isn’t sealing causing the oil to leak out the side of the rocker arm bolt.

Link to partzilla schematic:


Any ideas would be a help

Last edited by 86Hondatrx350; 05-13-2019 at 06:37 PM.
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post #2 of 3 (permalink) Old 05-13-2019, 07:55 PM
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Won't cause damage, just annoying. You don't have to pull anything off the motor but the rocker cover. The rocker arms are held in place by dowel pins that can be a huge pain in the rear to remove sometimes. Once they're out the o-rings are easy to replace.
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'87 TRX350D
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post #3 of 3 (permalink) Old 05-13-2019, 09:35 PM
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Only one of those dowels come out easy generally... the one retaining the compression release shaft might fall down alongside the cam chain (possibly fall down into the crankcase) while you're removing the rocker box cover. So keep an eye out for it.
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