Just how badly can a stretched chain affect performance?
I have a 3.9l in my '89 Range Rover (NAS). It has 190K+ miles on it. I need
to replace my water pump and it was suggested I do the timing chain/gears at
the same time. It's a bit more work, but I would be willing to do it if it
means more power or a better running engine.
The engine seems to be running fine as far as efficiency goes. It lacks in
being able to rev freely (especially compared to my '97 4.0). I figure the
engine, particularly the upper end, in general is getting old.
I also experience some surging on off throttle/overrun that I though I had
fixed with either cleaning the stepper motor or replacing the vacuum can on
the distributor. Could the slack in the chain be held accountable for
causing the timing to fluctuate enough to create this surging?
I will no doubt have to rebuild this engine in the next year or so, but if
it is worth it, I will replace the timing set now.
The next question would be which timing set? Do I spend the extra money for
a true roller? Is the timing set for a Buick 215 and/or '75 Skylark Odd-fire
V6 the same as my Rover V8?
Also open to any BTDTs. I have the workshop manual, but assume it involves
removing everything off the front of the engine before I can remove the
timing cover. Do you have to drop the oil pan too? Is it worth while to
remove the radiator for added work space? I'll probably start by taking the
front tires off as I can hardly reach into the engine bay.
Thanks,
Larry M.
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