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WD motor issue,,Opinions please!

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Topic: WD motor issue,,Opinions please!

Posted By: LarryWC In
Subject: WD motor issue,,Opinions please!
Date Posted: 29 Nov 2009 at 9:09pm

I have #1 cylinder oil fowling out,,#2 is carbon fowled some,,and #3 and 4 are clean as a whistle!

The plugs in 3 and 4 look like brand new.

I'm considering pulling the head and checking the valve guides in and seeing if the valve stems are worn.

It only smokes when it idles for a while, once i throttle it up, it clears up,but then I loose #1 cylinder.

Now, I don't put a lead additive in the gas,and I don't know if it's ever had hardened guides put in it, so I'm thinking that may be a place to start?

What do you gear head AC guys think?

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Replies:

Posted By: JohnCO
Date Posted: 29 Nov 2009 at 10:14pm

How is the compression? Could it be the rings?

Posted By: LouSWPA
Date Posted: 29 Nov 2009 at 10:47pm

rings or valve guides

Posted By: Cal
Date Posted: 30 Nov 2009 at 7:21am

I would take the valve cover off and see if there is any sludge near 1&2 causing the oil to drain down the valve stem. Cal in Ct.

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Posted By: LarryWC In
Date Posted: 30 Nov 2009 at 7:24am

OK,,I will check compression and also check the valve stems and see what we have here!

Thanks guys!

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Posted By: CTuckerNWIL
Date Posted: 30 Nov 2009 at 8:34am

What plug are you using. I used to have trouble with the CA fouling 1 plug after a few hours on new plugs. I put the next hotter plug in and never touched a plug the rest of the mowing season. The CA sat for 10 years before I started using it. The more I used it, the better it ran. The CA had ring problems so if your's is valve guides, hotter plugs might not do as much good.

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Posted By: alan_IA
Date Posted: 30 Nov 2009 at 9:18am

sounds like what I had, turned out #1 had a scored cylinder wall. Cost less to replace motor than rebuild. I now have a WD45 motor in my WD. hope your problem is not that bad.

Posted By: Gerald J.
Date Posted: 30 Nov 2009 at 9:45am

You don't use hardened guides, its hardened seats for the valves with no lead fuel. You aren't working it hard enough to need the hard seats.

When to adjacent cylinders have similar problems its often the head gasket is blown between them, and likely in this case adding an oil passage that's leaking more to #1.

Valve guides tend to leak more with a high manifold vacuum and the highest manifold vacuum is while the engine is coming down in speed from running fast at the time the throttle is closed. So if you goose it, then close the throttle, and get a puff of blue smoke as it gets down to idle speed, that's valve guides, specifically intake valve guides. Seals can do wonders. Guides can do wonders, but then you have to do a complete valve job cutting the seats to be concentric with the new valve guides. And probably break for new valves too.

It could a rocker arm problem where #1 exhaust isn't opening much if at all, but I bet on the head gasket.

Adding a so called lead additive to the gas gets you more rapidly fowled plugs and a thinner wallet, that vendor more profit, does nothing for engine performance or longevity.

Gerald J.

Parallelizability sclerenchyma guv stringed gamut tubule enevelope orcein lawyering. Expiring cataphoresis, thereon apodal typhlitis precontact selenious supplicate haustellate.

Posted By: LarryWC In
Date Posted: 30 Nov 2009 at 9:58am

Good points Gerald, I'm not as familiar with these engines as others so I appreciate the input on this!

wouldn't the compression test also indicate a possible head gasket issue?

Posted By: Coke-in-MN
Date Posted: 30 Nov 2009 at 10:15am

Gerald covered most things well . might also do a leak down test with compressed air but if oil burning is the problem from guides this will not show up. Fouled plugs can also be from leaks if the plug is burnt.

Parallelizability sclerenchyma guv stringed gamut tubule enevelope orcein lawyering. Expiring cataphoresis, thereon apodal typhlitis precontact selenious supplicate haustellate.

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Posted By: LarryWC In
Date Posted: 30 Nov 2009 at 3:04pm

OK,,,,the verdict is in!

Gerald,,,#1's exhaust valve screw had backed it's self off and was barely opening the valve!

#2 wasn't much better, plus, I had a spark plug that had a small crack along the side of the electrode and was firing down in the plug and not at the point where it should!

after setting the clearance back on the two valves and a new set of plugs,,I'm pullin' wheelies now!!,,,well,,,not really,,but she's runnin' real darn good now!

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Posted By: LarryWC In
Date Posted: 30 Nov 2009 at 3:06pm

Oh yeah,,,and I STILL don't know for sure where the oil was coming from,,but I ran her for quite a while and never saw a hint of it!

I'll keep an eye on that though.

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