smallport head issue?

jakes_hachiroku
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smallport head issue?

Postby jakes_hachiroku » Wed Nov 01, 2017 12:48 pm

so at the biggining of this season I switched from a big port head to a smallport head on my 3 rib block. and ever since since I have been running into oil getting to were my plugs are and just pooling up and eventually seeping onto the plug and fouling it out! the drain that's at the back of the smallports ive just plugged because my block doesn't have it (being the 3 rib) ive checked valve cover gaskets and even those little threaded plugs that go down the middle of the 4age heads and ive even let it run and just waited for the oil to start coming out but I think its only happening under load so I don't know! any ideas?

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totta crolla
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Joined: Tue Mar 26, 2013 5:21 am
Location: Oxford U.K

Re: smallport head issue?

Postby totta crolla » Wed Nov 01, 2017 2:20 pm

Which inlet manifold are you using ?
Modded smallport or TVIS with smallport adaptor ?

jakes_hachiroku
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Posts: 56
Joined: Wed Jul 15, 2015 1:25 pm

Re: smallport head issue?

Postby jakes_hachiroku » Wed Nov 01, 2017 4:01 pm

totta crolla wrote:Which inlet manifold are you using ?
Modded smallport or TVIS with smallport adaptor ?

I'm running weber dcoe 40 carbs with a bigport manifold and T3 adapter plate to mate it to the head

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jondee86
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Re: smallport head issue?

Postby jondee86 » Wed Nov 01, 2017 10:25 pm

There are really not too many possibilities for getting oil into the plug valley. If the
cam cover gaskets are still soft and not compressed flat, they should seal OK. And the
special rubber faced washers that go under the chrome nuts also have to be soft and
not baked hard. Once they go hard they are not reusable, and you need to dig deep
for a new set.

The one place that is not so obvious is the corner between the head surface and the
front cam cap. The FSM says to put a dab of "seal packing" (= high temp oil resistant
silicone) in those corners before installing the cam covers. The idea is to stop any
potential oil leakage, and if you missed that out I guess it could be possible for oil to
find its way into the plug valley. Obviously, it would fill from the front of the engine.

Clean it off, give it a short run and then inspect.

Cheers... jondee86
Give a person a fish, they eat for a day. Suggest they search before posting, and they learn a skill for a lifetime.

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totta crolla
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Posts: 448
Joined: Tue Mar 26, 2013 5:21 am
Location: Oxford U.K

Re: smallport head issue?

Postby totta crolla » Thu Nov 02, 2017 1:36 am

Where is the cam cover breather going to ?

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