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Old 07-28-2012, 06:52 PM   #1 (permalink)
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noise from 404

so i just swaped in a high comp head on my 61 404 . it is up on power but the head seams very noisey in 5th and 6th gear. the noise quits on decel. sounds like loose timing chain. the valves are adjusted correctly. when i take the valve cover off the chain is loose on drivers side. is this normal?
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Old 07-28-2012, 09:38 PM   #2 (permalink)
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Possible your chain tensioner is not pumping up, but when I did my HC head I had to drop half a link from my timing chain to get proper tension.
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Old 07-28-2012, 09:59 PM   #3 (permalink)
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it seems the tensioner is not doing its job. tryed both tensioners and after the motor is turned over it has slack. has any one taken apart it and made the stopper longer so it wont slack up? dont want to break a chain. the chain looks to be in good shape.
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Old 07-28-2012, 10:57 PM   #4 (permalink)
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You need to manually pump it up before you start the engine after the head swap. If its not long enough you need to find a half link and shorten your chain.
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Old 07-28-2012, 10:58 PM   #5 (permalink)
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Theres a ball, spring, and cup in the tensioner that can wear out. Take it off and try and pump it up while submerged in some oil. It should pump up and become very difficult to compress. If it doesn't it is bad.

You did use the Car head gasket and not the Unimog head gasket when you installed the head?

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Old 07-29-2012, 09:51 AM   #6 (permalink)
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Quote:
Originally Posted by singham View Post
Theres a ball, spring, and cup in the tensioner that can wear out. Take it off and try and pump it up while submerged in some oil. It should pump up and become very difficult to compress. If it doesn't it is bad.

You did use the Car head gasket and not the Unimog head gasket when you installed the head?

Cheers,

Scott Ingham
yup got the gasket from you. perfect fit. and it seemed to be pumped up and difficult to compress in the old head. this is making more sence now.
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