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Old 07-31-2010, 02:02 PM   #1
amorgan93
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Wrench Weird knock 94 SL2.

This knock is like none ive ever heard . Ive had my dad who is a mechanic and a good friend who is also a mechanic to listen to the motor and the only thing we think it could be is a broke timing chain guide, since my dad worked on a Hyundai that made the same noise and a broke guide was the problem. Any ideas? Only knock at lower RPMs and when accelerating from idle. accelerating from a higher RPM, it does not knock.

here is a video i made. Maybe it will help: http://www.youtube.com/watch?v=Mz5-PwOIfSg

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Old 07-31-2010, 09:24 PM   #2
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Default Re: Weird knock 94 SL2.

I would check the belt tensioner. It can be noisy at low RPM's when it is failing and quiets down as you accelerate.

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Old 07-31-2010, 11:08 PM   #3
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Default Re: Weird knock 94 SL2.

+1; sounds like the belt tensioner slapping. I _think_ I even saw the belt deflect for a few frames one time when you revved it up. Confirmation - remove the belt and run the engine BRIEFLY (you have three minutes from a COLD engine, but you only need a few seconds). If no noise, the problem is in the belt, tensioner, one of the pulleys, etc.

Get those bolts for the engine mount out of the timing cover and get some proper studs. You can't properly torque bolts for that application.

Nice old Ford pickup. '75-ish?

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Old 08-01-2010, 01:04 AM   #4
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Default Re: Weird knock 94 SL2.

Quote:
Originally Posted by madpogue View Post
+1; sounds like the belt tensioner slapping. I _think_ I even saw the belt deflect for a few frames one time when you revved it up. Confirmation - remove the belt and run the engine BRIEFLY (you have three minutes from a COLD engine, but you only need a few seconds). If no noise, the problem is in the belt, tensioner, one of the pulleys, etc.

Get those bolts for the engine mount out of the timing cover and get some proper studs. You can't properly torque bolts for that application.

Nice old Ford pickup. '75-ish?
yep 77 f100 2wd. the bolts were the strongest money can buy. They were nearly $3 bucks each. Stronger than grade 8. And one of the holes needs to be heli-coiled. One of those bolts were just sitting in the hole. And isn't the belt tensioner just a pulley? This knock is internal i'm pretty sure but ill definitely try what you said

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Old 08-01-2010, 02:48 AM   #5
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Default Re: Weird knock 94 SL2.

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Originally Posted by amorgan93 View Post
the bolts were the strongest money can buy. They were nearly $3 bucks each. Stronger than grade 8.
Bolt strength is irrelevant. You're putting the torque that holds the mount down directly on the threads in the timing cover, which will damage them (may explain why the one is damaged). The studs are torqued to the timing cover to 89 in-lb, and the nuts are torqued onto the mount to 37 ft-lb. This can't be accomplished with bolts.

I don't think folks have had much luck with heli-coils in this application. I think they tend to just crack the cover. A new timing cover is usually in order.

Quote:
And isn't the belt tensioner just a pulley?
No, it's spring loaded, and moves on a pivot. When the spring wears, the pivot moves as the belt deflects, and when it moves to its limit, it makes noise.

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