Camshaft Degreeing Help Please!

Simeon · Post by **Simeon** » Fri Jul 17, 2009 12:02 pm

Hi All
I'm a little confused with setting up the crank and cam timing. I have a rover v8 with a piper 270 cam. I have fitted the cam and sprockets and set the sprocket alignment marks to face each other. Standing at the front of the engine:
Can I confirm number one piston is the the closest one on the left hand side?
Can I confirm the lifter where I want to set the DTI on is the closest one on the left hand side?

I have put what I believe to be number one piston to TDC using a piston stop and then aligning a fixed pointer to 0 dgrees on the protractor attached to the crank.
I had a quick play last night and found that the lifter reached max lift at 333 degrees and started to drop at 226 (I may have got the numbers the wrong way I round I'm writing this from memory). The spec sheet says max lift should be at 108 degrees ATDC. The figures I've got are not in the same ball park!
Am I doing something wrong?
If it turns out that I am fairly correct and a few degrees out, how do i adjust the vernier sprocket after I have loosened the three allen key screws? surely this would only take up any slack in the chain because you would moving one sprocket and not the other.

Any help and advice would be greatly appreciated.

Thanks Simeon

CastleMGBV8 · Post by **CastleMGBV8** » Fri Jul 17, 2009 12:14 pm

Number 1 is the cylinder on the right from the front.

In loosening the vernier bolts you are able to move the the crank and cam sprokets in relation to the cam position.

Kevin

Simeon · Post by **Simeon** » Fri Jul 17, 2009 12:17 pm

Thanks Kevin - Thats a start!

marcosman · Post by **marcosman** » Fri Jul 17, 2009 3:29 pm

As previously said No 1 cylinder is on the right when looking at the front of the engine, the inlet lobe is the second lifter on the right.

There is a good page on the RPI website for dialing in the cam. Very important to establish true TDC as the dial gauge will show TDC over a few degrees. Better to use a piston stop and set the protractor to zero on the midpoint before you do anything else. Again, when the cam lobe is on max lift there are a few degrees duration where the dial gauge will not move. The mid point of this duration has to be taken as the cam max lift after top dead centre ATDC.

To further check the timing after adjustment also check when the inlet valve starts to open and close.

Simeon · Post by **Simeon** » Sat Jul 18, 2009 9:29 am

Sorry i wasn't being rude, we lost power all of last night from the storms, no internet. Thanks for all your help it makes sense now.