AOS - Question

[Muskoka Minute]

Not yet.
I have to do some more research on how to do that.
I'm also going to check the water pump tonight on the off chance.

[911monty]

Originally Posted by Muskoka Minute

Not yet.
I have to do some more research on how to do that.
I'm also going to check the water pump tonight on the off chance.

I don't think that noise is from the WP. My thought is that something Mechanically changed between the crank position sensor and the cam position sensor after AOS failure. Possibly from hydrolock, but first thing you need to confirm is mechanical integrity. Since the CPS gets signal from the flywheel which is bolted to the crank it is pretty safe to assume that didn't change. The mechanical relationship between cams and crank is maintained by cam chains and their tensioners. The cams could have slipped at their adjuster plates or the cam chain tensioner and/or ramp could have failed. Either one of those scenarios would cause the cams to be retarded. However with the noise from the engine, cam chain slop is more likely. Both of these can be visually confirmed or eliminated by checking the cam timing.

[Muskoka Minute]

Originally Posted by 911monty

I don't think that noise is from the WP. My thought is that something Mechanically changed between the crank position sensor and the cam position sensor after AOS failure. Possibly from hydrolock, but first thing you need to confirm is mechanical integrity. Since the CPS gets signal from the flywheel which is bolted to the crank it is pretty safe to assume that didn't change. The mechanical relationship between cams and crank is maintained by cam chains and their tensioners. The cams could have slipped at their adjuster plates or the cam chain tensioner and/or ramp could have failed. Either one of those scenarios would cause the cams to be retarded. However with the noise from the engine, cam chain slop is more likely. Both of these can be visually confirmed or eliminated by checking the cam timing.

I'm going to check/adjust the camshaft timing tonight.
Can this be done with the spark plugs in?
or do they have to be removed? or does it just make it easier with them out


On a side note...
I found a used Durametric - Professional for $575 US plus shipping....
Seams like a lot of money...

I don't know what to do?
How imperative is it to have one?

[911monty]

Originally Posted by Muskoka Minute

I'm going to check/adjust the camshaft timing tonight.
Can this be done with the spark plugs in?
or do they have to be removed? or does it just make it easier with them out


On a side note...
I found a used Durametric - Professional for $575 US plus shipping....
Seams like a lot of money...

I don't know what to do?
How imperative is it to have one?

Finding TDC is much easier with the spark plugs out. An easy method to determine TDC on the bank you are on is about 180 deg before TDC (pin location on crank) place something finger, palm etc. over the #1 cyl plug hole (you can even use your compression tester). Then rotate to TDC you will feel/hear the air escaping if you are on the correct cylinder (Rotate crank 360 degrees to check bank 2). DO NOT ROTATE CRANK BACKWARDS.

Personally I would wait on the Durametric until you confirm cam timing. And I see no reason to purchase a professional version unless you plan on advanced application such as writing/changing code to the DME. The Enthusiast will do everything you need to do and is new from Durametric for around $285.00 and is good for 3 cars and maybe more.
Again my .02 cents. Now where are the experts??? JFP, Jake I'm absolutely certain they have experienced failure modes due to failed AOS.