A few questions about resealing front timing cover for DOHC

[freeonboard]

re: 1992 240sx(I'm not replacing timing chain)

1. I'm resealing the front timing cover. I will replace the crankshaft external oil seal. Are there any other seals I should replace? The fsm mentioned an o ring for where the oil comes or leaves the cover.



2. Is there a reason to replace lower chain guides? how would they fail?

3. should you move the power steering pump away from front cover to make room?

4. Someone mention a hat seal? Anyone know what that is?

thanks in advance:)
Modified by freeonboard at 12:27 AM 1/20/2009

[NISSAN240SX12]

you dont have to remove the front cover to replace the front crankshaft seal. the hat seal is the oil seal that goes between the block and front cover. you dont have to replace the lower guides unless they are broken. new timing guide kits are made of better material than the original OEM guides.

[Xj220gt]

Sorry to bring this up again.

I was installing my old timing chain in a new block today. I am using my old front cover and realized that I had an o ring seal in the cover where it is supposed to go, but then I realized that on the block, there was another o ring..... I am not sure if the last owner changed the timing chain at one point. it looks like he pulled the old cover at some point....

Do I need both o rings on? if not, will I be ok by putting the one o ring on the front cover?

the new block is an s13 ka24de btw, just in case that helps.

[freeonboard]

there is only one hat valve to replace as far as i know. and the main seal for crankshaft