Help with engine diagnosis, excessive crankcase pressure? - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 23 (permalink) Old 06-13-2018, 04:57 AM
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Re: Help with engine diagnosis, excessive crankcase pressure?

Glad to hear you got the water leak fixed, but blow-by can only come from cylinder seal. There is nothing else making pressure in the engine that would end up in the PCV.

If it still has excessive blow by, and you cannot deal with it, it needs a rebuild. Note that a re-ring may temporarily help, but generally ring seal fails for a reason, and it's often from heat-generated or work-generated from some other issue such as cylinder taper, misshapen cylinder, etc that the ring has to work overtime to try to follow

As far as head bolts, they can be reused to "just before failure" LOL on that engine. They are not torque to yield, and although aftermarket bolts are very good, Fords typically can live through many uses. You'll know a bad one, as you increase torque, it either won't get there, or it takes more turns than the other ones as you come up to a torque setting. Readily apparent when 9 bolts take a 1/4 turn to get to the next step and the 10th is at 1/2 or 3/4 and still hasn't got there

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post #17 of 23 (permalink) Old 06-13-2018, 10:12 AM
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Re: Help with engine diagnosis, excessive crankcase pressure?

The head bolts do not go into water on 351Ws.

Experimental Ford parts collector.
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post #18 of 23 (permalink) Old 07-06-2018, 02:09 PM Thread Starter
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Re: Help with engine diagnosis, excessive crankcase pressure?

Hey Guys,

The coolant leak has gotten worse, not better. The coolant is leaking down into the pan from the lifter valley. Oil on the dipstick is contaminated, easy to see. I'll be taking it apart when I get back next year, I just don't have the time now to delve into it now. I wasn't sure about the head bolts, thanks for the clarification. Once I take it apart and take a look at it, I'll need your experiences again to diagnose it I'm sure! Talk to you guys soon!


-Pete
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post #19 of 23 (permalink) Old 07-06-2018, 03:14 PM
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Re: Help with engine diagnosis, excessive crankcase pressure?

Hi there,

What is meant by "torque to yield"?

Mel

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post #20 of 23 (permalink) Old 07-07-2018, 07:13 AM
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Re: Help with engine diagnosis, excessive crankcase pressure?

bolts are strongest just before they break. torquing them to that point stretches them enough that they can't be reused
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post #21 of 23 (permalink) Old 07-07-2018, 10:27 AM
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Re: Help with engine diagnosis, excessive crankcase pressure?

A torque to yield bolt is designed to take advantage of a certain plasticity, once torqued, it won't return back to it's original size. It started basically in the 80s with mainstream aluminum heads.

There are also other terms like torque-to-angle, and a few others. In the end, it's a bolt designed to be used once, generally torqued, then turned an additional amount afterwards and left alone. When removed, you toss them

https://en.wikipedia.org/wiki/Torque-to-yield_fastener

70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor.
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post #22 of 23 (permalink) Old 09-04-2018, 11:59 AM
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Re: Help with engine diagnosis, excessive crankcase pressure?

Engine doesn't really smoke at all anymore, maybe it did the first time because it was sitting awhile. I'm leaving on a deployment soon, so I'll take it apart and inspect it when I get back next year. I'm just curious to see where exactly the problem is.
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post #23 of 23 (permalink) Old 09-05-2018, 06:55 PM
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Re: Help with engine diagnosis, excessive crankcase pressure?

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