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Junk rings


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I'm going to try here first.

I have a Willys Knight model 87. I rebuilt/assembled the engine out of boxes several years ago.

I mistakenly, surgically cleaned and assembled the engine and have been driving it for about three years now.

4-5k miles. It runs super quiet, smooth and has plenty of power but continues to smoke excessively when cold.

I am guessing that I may have damaged the junk rings in an attempt to tighten them on the head.

I have a set from a used model 70A. I think the bore is the same. Will they fit?

I can't find part numbers. I would post this on the WOKR but can't seem to get on that site.

Anybody know?  Ivan?

All suggestions appreciated.


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Right now they are using a beta site for testing new software. Looks good.




Click on Community, then Forum.

Edited by Frank DuVal (see edit history)
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Thanks Frank,

I was able to register. Waiting for confirmation.

I am almost sure that I have this data somewhere. Just have to find it.

I hate to tear the 87 down and find out the 70A parts don't fit.

The car is currently running and I hate pushing cars!


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  • 2 weeks later...

Oil burning when cold was characteristic. An old timer who used a 1924 WK 4 cylinder as a tour car told me it burned a quart of oil in 60 miles. After that, nothing. Next day it would burn a quart in sixty miles, then nothing. It took that long to completely warm up. This was in the 1960s and an original unrestored car.


Have also heard they run better and produce more power the more miles they have on them. So, you might try taking a few long tours and see what happens.

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  • 3 years later...
On 1/2/2018 at 11:46 PM, JFranklin said:

Does detergent oil keep the carbon from forming or sticking? It is the carbon that seals things up.

Having owned, and driven a 1927 Willys Knight 70A for a couple of years now, I feel fairly familiar with the six cylinder sleeve valve engine.

I have been advised, and strictly adhered to this advice, to steer clear of both multi viscosity and high detergent motor oil for use in this engine. 
New car ads published when these engines were first sold says the engines get better with age and mileage as the carbon build up between the sleeves acts as both a lubricant and sealant. Remember, these engines were hand made and clearances were a lot more forgiving than a computer/robot built engine of today.

Maintenance of the oil rectifier is recommended, and, while it may help with the smoking problem, it surely won’t be a cure. 
My sleeve valve engine does smoke more than my 1923 DB Roadster 4 cylinder on start up, and it does smoke more than would be normal for a modern engine when left idling for a fairly long period of time.

But, after it warms up, and I’ve driven it for a few miles, it returns to the normally expected puff of smoke as I pull away from a stop.

And, I have had police approach me in regards to my old Willys smoking, but it was to look at the car and compliment me on how well a 94 year old lady looked and ran.


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