Does anyone know if it is possible, or a least feasible to machine the
center two cam bearing bores. My motor spun the center two bearings and
snapped the camshaft in two. I am thinking that this could get more costly
than the engine is worth. By the way what is up with the hollow camshaft? I
have never seen one before!
Better to simply get another engine. The machine work can be done, but who
knows what the cost will be. Availability of oversize cam bearings is
question. I've seen a few of these engines fail this way. Usually, it's
worth fixing them. The problem stems from the coolant getting into the
the old intake gasket problem.
GM used the hollow camshafts on these engines. Simple to manufacture,
It's a hollow tube, the lobes are positioned correctly on the tube, and then
force a ball thru the tube....expanding the tube and holding the lobes in
Here is a blurb on the camshaft:
The cam phasing creates "dual equal" valve timing adjustments. In other
words, the intake valves and exhaust valves are varied at the same time and
at the same rate. The cam phaser vane is attached to the camshaft on the
front journal - a technique made easier by the award-winning
"assembled-camshaft" design pioneered by General Motors. With this design,
separate camshaft lobes are installed on a hollow camshaft tube rather than
the traditional method of grinding a camshaft from a single piece of stock.
Interesting manufacturing process, but I would suspect that it would tend
to have quality issues unless extremely meticulously developed. GM does
not always cross all the "t"s and dot all the "i"s when they bring a new
process to market.
If you are planning on pulling the engine yourself....and you do not have
the equipment to pull the subframe/engine and trans down.....there is
another way. If you just remove the intake and cylinder heads, there is
just enough room to pull the bare block out thru the top. I've done it this
way a couple of times. Pulling the cylinder heads is easy.....common repair
on these engines.....so I've switched from dropping the sub, to simply
removing the heads and then removing the block.
Hope this helps!
I already have the engine out by dropping it through the bottom. This can be
done with two floor jacks, one on each side of the subframe, once I got it
dropped down on the jacks I then raised the van off it with a chain fall.
Taking the heads off in the vehicle didnt look easy either.
Do you pull the trans with the engine? It looks as though it would have been
impossible to get it off the trans in the subframe.
Oh well it is out now and awaiting the delivery of the other engine.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.