|
Bob-Wyo
12-23-2003 20:26:48
|
|
Re: Cam timing? in reply to Jonathan, 12-23-2003 10:34:25
|
|
|
Johnathon, this is from Green Mag June 1991, but it matchs my JD book to.
1st you need to establish True TDC, as I found on my D it was 1" off the mark so had been runing timing way to fast.
On your G,13000, up,
intake open--5 degrees - BTDC
intake close-55 degrees- ABDC
Exhaust-open-45 degrees- BBDC
Exhaust-close-10 degrees-ATDC
As I have learned head work needs to be checked, after 3 years fighting a goofy acting #2 cyl it was the intake valve not seating good, head work done by a very highly recommened shop.
Another D my friend paid dearly for a valve job and then couldnt get it started, I found #1 exhaust valve had a shoulder on it and was hitting the valve guide,(holding it open) all this should have been found before they ever left the shop.
This is why I questioned the valves seating.
I have just been taught a very good lesson on how to check out the valve job, pour solvent in the ports, if they leak, need to do some more lapping, in your case a good air test is what I would do, if the valve timing checks OK, that air test will tell you where your problem lies real quick.
Hope this gives you some help, Bob
|
|
|
