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mysterious high pitched whine

1K views 6 replies 5 participants last post by  Work Horse 
#1 ·
Hello everyone, I’m wondering if anyone has any ideas on how to solve this problem:

I just finished swapping a short-block: put my heads on, set preload, extractors back on, and reinstalled the manifold with carby. The carby stayed on the manifold and was untouched during the swap. It ran perfectly well with the same parts before but now I have a high pitched whine and it wont idle.

Manifold vacuum increases with rpm and never dips down on application of the accelerator whilst in park. I’m not sure if that’s normal or a clue to my problem.

Otherwise it runs very smoothly as long as I don’t try to idle it.

Swapped to a different carb – no change.

Any help much appreciated!
 
#4 ·
Yes, Brenx. It was the manifold. I removed the carby and retorqued the manifold bolts and the sound went away.

That was easy. Can you believe I’d been wondering about it for two days?

I took the manifold off with carby on and having it still bolted there on re-installation may have prevented the manifold flexing enough to seal up properly. . . . It’s a crazy world.

Thanks for the replies.
 
#7 ·
Glad you found the problem 351ZAFairlane. :hy:

I was going to suggest checking to see if my wife was under your bonnet!!
Get it, high pitched whine!!!

Lookout it's Friday night and Work Horse has been on the turps!!

Move away from the computer Work Horse!!

I better go guys, if my wife comes in and reads this I will get a slap :priest:
 
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