Post by
meminto »
https://forums.nicoclub.com/meminto-u95701.html
Mon Oct 12, 2009 12:39 am
Hi mate, sorry for the long few hours, only recently got home from work..
It is a good rule of thumb to lightly grind the seal area (on the head and the cam cap housing) to ensure a clean surface with just that little bit of micro roughness for the seal to bite into the seal area.
You can use some 1800 grit wet and dry sand paper (wet it up) as an alternative and carefully sand around this area to achieve the same result..
When I install them, I use some petroleum jelly or vasoline (or a petroleum based lube).
Spread a light smear of the lube around the inside of the cam seal, and the camshaft itself.
Spread a light smear around the edges of the cam seal as well.
Now the art in it is to slip the cam seal on an slight angle over the camshaft, it is hard to explain without a diagram (i see another video production coming up in the near future lol), but what the petroleum lube will do is help stop the seal lip being caught and roll back over the spring.
I find oil is not as good for this, for some reason it is not as effective, but I am unsure why, maybe its such a thin amount it just wipes away from the seal/cam area and it grips, but I don't have an explanation for it..
You can slightly undo the cam cap bolts (be careful doing this) so it is easier to press the seals in.
Now push the seals into the seal area on the head, until they just sit firmly an evenly in the first 2mm of the seal.
Find a piece of pipe about 6" in length that will fit over the end of the cam around 1-2mm smaller than the diameter of the cam seal, ensuring no jagged edges on the flat surface.
Place this over the cam, against the cam seal, and using a rubber mallet (or very carefully with a hammer) tap on the pipe stopping every two or three taps to inspect that the seal is pushing in evenly, you may need to tap on one side of the the pipe then the other or further towards the top then the bottom to get this right.
Once you get to the point where the seal wont move in any further, it should be relatively flush with the seal housing. Inspect that it is evenly placed around the housing seal, clean up the excess petroleum based lube and reapeat for the other camshaft.
Then your done, kick back with a cold beverage and admire your handiwork
AS a side note, this process works equally as well for the front main seal..
Hope it helps you out..
Cheers,
Matt