Bearings

mgme · Post by **mgme** » Sun Sep 30, 2012 4:12 pm

Has anybody rebuilt a Thor 4.6 who could advise. Is something missing at the bulkhead end perhaps?

Much thanks in advance.

spend · Post by **spend** » Sun Sep 30, 2012 4:44 pm

Sounds to me like the seal at the back of the cam hasn't been seated deeply enough.

I wouldn't worry as long as the cam spins freely with the chain fitted.

mgme · Post by **mgme** » Sun Sep 30, 2012 5:03 pm

Thanks Dave,

Do you have any further information on the seal? Is it attached to the block or camshaft?
Many thanks in advance.

spend · Post by **spend** » Sun Sep 30, 2012 6:52 pm

The seal is pressed in (its removed to change the cam bearings BTW) ~ but I was just beinga little flippant anyway - just forgot the ';)' seemed very odd that you had nearly 1/4" play.

Cam shaft machining for the 3.9 & 4.0/4.6 style are a bit different and seem to result in varying aftermarket tolerances, but 1/4" play does sound to me like the cam is going too far into the block (not the fault of the retainer more the cam machining IYSWIM)

Just have a look where the cam lobes can wander to with a couple of adjacent followers fitted as a visual guide so you can verify where the cam should really be fitted?

mgme · Post by **mgme** » Sun Sep 30, 2012 7:46 pm

Thankyou Dave,
As was said above play is removed with sprocket ftted. However, confirming that either the wrong manual is being used or a seal is missing would be positive.
If there is anyone else who could help it would be most appreciated.

Update: Spoke to a reputable company this morning and it would appear if there is no slack with the wheel fitted all is well.
Thanks to all who helped.