noise from 404 - Pirate4x4.Com : 4x4 and Off-Road Forum

the 59 fiat · 07-28-2012, 05:52 PM

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?

Puffdragon · 07-28-2012, 08:38 PM

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.

the 59 fiat · 07-28-2012, 08:59 PM

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.

Puffdragon · 07-28-2012, 09:57 PM

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.

singham · 07-28-2012, 09:58 PM

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

the 59 fiat · 07-29-2012, 08:51 AM

Quote:

Originally Posted by singham

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.

07-28-2012, 05:52 PM	#1 (permalink)
the 59 fiat Registered User Join Date: Oct 2011 Member # 201841 Location: yelm wa Posts: 33	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?

07-28-2012, 08:38 PM	#2 (permalink)
Puffdragon Registered User Join Date: Sep 2002 Member # 13683 Location: Unknown Posts: 3,192	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. __________________ K.C.

07-28-2012, 09:57 PM	#4 (permalink)
Puffdragon Registered User Join Date: Sep 2002 Member # 13683 Location: Unknown Posts: 3,192	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. __________________ K.C.

07-28-2012, 09:58 PM	#5 (permalink)
singham Wheeler Join Date: Jun 2002 Member # 12488 Location: Vallejo, CA Posts: 338	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 __________________ [B]Expedition Imports [url]www.expedition-imports.com[/url] 225 Bennett Ave., Vallejo, CA 94590 707-643-6757 Unimog/Pinzgauer/Haflinger[/B]

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07-28-2012, 08:59 PM	#3 (permalink)
the 59 fiat Registered User Join Date: Oct 2011 Member # 201841 Location: yelm wa Posts: 33	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.