1983 D150 six cyclinder.

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John - 04 Jul 2006 19:42 GMT

I have a 1983 D150 that has a dead number 6 cyclinder I'v replaced the
intake manifold gasket fuel pump and carburetor and put new plugs,wires,
rotor button and distributor cap onn and checked for bad valve springs
and such.
Could it have jumped timming or something?
I was first told it was the intake manifold sucking air.
Any help welcome.

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SnoMan - 04 Jul 2006 20:21 GMT

>I have a 1983 D150 that has a dead number 6 cyclinder I'v replaced the
>intake manifold gasket fuel pump and carburetor and put new plugs,wires,
[quoted text clipped - 3 lines]
>I was first told it was the intake manifold sucking air.
>Any help welcome.

Start with a compression check. Next I have seen those old 225 slant
six's wear cam lobes of sometimes (it actually happend to me once
about 30 years ago)
-----------------
The SnoMan
www.thesnoman.com

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Bryan - 05 Jul 2006 01:41 GMT

"John" queried:

> I have a 1983 D150 that has a dead number 6 cyclinder I'v replaced the
> intake manifold gasket fuel pump and carburetor and put new plugs,wires,
[quoted text clipped - 3 lines]
> I was first told it was the intake manifold sucking air.
> Any help welcome.

Possible causes:
1. Bent/burned valve
2. Blown head gasket

A compression check, as SnoMan suggested, will tell you whether or not you
have a cylinder sealing issue. If you do, forcing compressed air into the
sparkplug hole will tell you where you're losing compression:
1. air coming out of tailpipe = burned/bent exhaust valve
2. air coming out of carburetor = bent intake valve
3. air coming out between cylinder block & head = blown head gasket.
4. air coming out of crankcase = bad rings
If items 1, 2, or 3, you'll be pulling the head. If item 4, you'll be
pulling the whole engine. To do the test, you'll need a source of
compressed air and a tool such as this:
http://www.lislecorp.com/tool_detail.cfm?detail=189

Bryan

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John - 05 Jul 2006 03:18 GMT

> "John" queried:
> > I have a 1983 D150 that has a dead number 6 cyclinder I'v replaced the
[quoted text clipped - 22 lines]
>
> Bryan

Thanks for the advice I will try the test.

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Bryan - 05 Jul 2006 05:07 GMT

> > "John" queried:
> > > I have a 1983 D150 that has a dead number 6 cyclinder I'v replaced the
[quoted text clipped - 24 lines]
> >
> Thanks for the advice I will try the test.

You're welcome. I forgot to mention -- you need to test with both valves
closed. If you first remove the valve cover, you can tell when the lifters
are on the camshaft base-circle. You'll also be able to see if there's any
valvetrain damage (bent pushrods, broken/worn rockers, etc).
Bryan

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