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  #301  
Old 06-08-2022, 10:10 AM
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Burgerman Burgerman is offline
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Leakage into crankcase has me wondering if cylinders out of round. Any block history? Could somebody have excess honed it in the past?
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  #302  
Old 06-08-2022, 01:58 PM
bob w bob w is offline
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Straight from the engine shop. .030" overbore and hone, new pistons and rings. End gap is .018" I assembled it. The short block did sit assembled for 6 months before I put the head on and tried to start it.

About the only thing I can think of is the hone finish on the cylinders in not compatible with the rings.

I've been assembling engines since 1958, Never had this situation before. I've got an email into the engine shop. Awaiting his reply. Not blaming him. Just trying to figure it out.
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  #303  
Old 06-14-2022, 08:20 PM
bob w bob w is offline
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I was just about to pull the engine out and ball hone the cylinders when my very good friend, Terry showed up on his vintage restored (by him) Sportster. He said, "Stop!" there's nothing wrong with that part of the engine.
We spent most of the day verifying everything. Put the head, intake and all the other stuff back on the engine. Wouldn't start. After juggling different push rod lengths and rocker stand shims it started and ran. Push rods that seemed loose at rest were too long on the exhaust side causing the valves to hang open. This thing has short travel lifters and the push rods have to be the right length.
We ran it only for a minute but it sounded powerful and crisp.
After Terry left, I cut up some 8.5mm spark plug wires to fit. I removed the 2" carb spacer and the Holley carb wouldn't fit because of fuel line and linkage interference. So I did the right thing and replaced it with an Edelbrock branded Quadrajet. Don't ask me why.
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  #304  
Old 06-14-2022, 09:33 PM
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Burgerman Burgerman is offline
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Nice job sorting this out Bob. Glad your block is ok. Like powerful and crisp. Good friends rock. 👍
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  #305  
Old 06-14-2022, 10:17 PM
oneeye oneeye is offline
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Nice looking engine! Glad you got it sorted out.
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  #306  
Old 06-15-2022, 08:29 AM
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smallfoot smallfoot is offline
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Glad you got it figured out. I had faith it was something simple...
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  #307  
Old 06-15-2022, 11:56 AM
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Old Iron Old Iron is offline
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Glad you didn't finish pulling it apart cause, on the previous page post 300, I said it was the valves not closing.
Had this same thing happen on my 401 Nailhead
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  #308  
Old 06-15-2022, 12:11 PM
bob w bob w is offline
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Yes indeed, OI. I thought I had that area covered. Had the rocker stands shimmed with a slight bit of lash, like for a solid lifter cam. Apparently the hydraulic lifters pump up even at idle, possibly on the starter motor. Must be very short plunger travel in these lifters.

The high zinc 50 weight racing oil I had in the engine might have contributed. Possibly wouldn't bleed out of the lifters at the right rate.
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  #309  
Old 06-15-2022, 01:31 PM
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Old Iron Old Iron is offline
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These non-adjustable rockers are definitely touchy
The ole Nailhead only had 8 thou taken off the heads to clean them up and I ended up having to put adjustable push rods in it.

Last edited by Old Iron; 06-16-2022 at 05:54 AM.
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  #310  
Old 06-15-2022, 03:15 PM
bob w bob w is offline
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Quote:
Originally Posted by Old Iron View Post
These non-adjustable rockers are definitely touchy
The ole Nailhead only had 8 thou taken off to clean them up and I ended up having to put adjustable push rods in it.
That confirms my suspisions, OI.
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