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EFV-8 Club Forum / General Ford Discussion / 39 ford with sleeved cylinders

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Discussion Topic: 39 ford with sleeved cylinders

agriffey

02-08-2016 @ 9:37 PM

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I have a customer who wants me to rebuild a '39 V8 engine that has sleeves.
The sleeves are worn quite a bit.
What do I do now?
When I was a kid I think there was an oversized piston set for those engines after the sleeves were removed.

kubes40

02-09-2016 @ 6:17 AM

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Most shops pull the sleeves and bore to the next nominal diameter. On occasion you will find a block that has areas of thin casting. That's a chance that must be taken and addressed when rebuilding any Ford flatty.
I suggest at minimum a "bell test" be done prior to the expense taken of boring.
Those oversize pistons you recall were (if I recall correctly) .081". They have not been available for as long as I remember.
Another option is to install new sleeves. They are available but costly. Also, you need the proper equipment to install them and dare I say, some experience...

TomO

02-09-2016 @ 8:02 AM

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here is my opinion.To give the best service, I would re-sleeve the block to a standard bore using standard sleeves. When you bore it to the next standard size, the engines usually run hot. There is just not enough beef in the block due to the corrosion that has occurred over the years.

Tom

kubes40

02-09-2016 @ 8:10 AM

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Tom, Respectfully I disagree with you about the running hot theory. I have rebuilt more engines than I care to recall. Any and all with sleeves simply had them removed and I'd bored to next nominal size. I have never had an over heating issue. Not once.
However, I have had two blocks that once the sleeves were pulled, turned out to be junk. Now that was disappointing.
I suggested (at minimum) a "bell test" so there could be some confidence that the area surrounding each cylinder bore was in fact thick "enough". This test is obviously free and is quite good at noting thin areas of the casting. Good enough that if an area seems thin to the ear, it would prudently require further testing.

oldford2

02-10-2016 @ 1:04 PM

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At one time you could just pull the sleeves, hone and install pistons to fit the bore. .083 oversize pistons. Or, you could pull the sleeves and install nos "tin can" sleeves. HOWEVER, those oversize pistons are mighty scarce. I have found nos sleeves but only after months of searching. They are out there somewhere. As Kube says, pull the sleeves and bore to the next diameter. JMO
John

pauls39coupe

02-11-2016 @ 8:24 AM

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Pull the sleeves, and run .083 over pistons. The are available from Egge.
The thin sleeves tend to buckle around the exhaust valve area, if the engine runs hot for any reason.

agriffey

02-11-2016 @ 10:02 PM

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Thanks all.
I called Egge's today, they have .083" oversized pistons in stock.
376 dollars plus another hundred for the rings.
I will have to go that route, which seams like a sure way to get the old turkey running again for a long time.
I will use the original lifters but 8BA valves and guides.

pauls39coupe

02-12-2016 @ 7:51 AM

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Go with the straight stem valves, the one piece guides are much better, however Ford recommended using the later lifters as the contact area was larger on the mushroom valves. They felt that the smaller contact area of the straight stem valves could lead to cracking of the lifter top.

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