VHPD Timing Marks

The Oily Bits S1 Specific Topics
1

Just removed head off Exige - as I suspected the cambelt has slipped a few notches (not unknown on the k in cold weather :wink: )- good news is no damage apparent (yet!)

Are camshaft timing marks same as for a standard K16?

Cheers all

2

Can’t answer your question I am afraid but could you re-assure me abt slipping cambelt in cold weather?
Mine’s not moved for a couple of months now. When does this problem occur? On start up?
I can’t wait much longer before I fire her up for a run . . .

3

If you have the 190 kit correctly fitted then the standard timing marks will not line up when the engine is at 90 BTDC.

The inlet sprocket will appear to be a good few teeth out.

OTOH if you dont have the 190 kit and the crank is at 90BTDC and the timing marks dont line up then I would mke them.

I have never seen a cambelt with manual tensioner slip any teeth other than when the cambelt was hopelessly slack or the cambelt was disintegrating.

Healthy and properly tensioned cambelts shouldnt slip.

Dave

4

Thanks for yoour reply Dave

Cambelt appears to be properly tensioned and in good condition but inlet valves have just been catching the top of pistons (on all 4 cylinders) - suggesting that the inlet camshaft sprocket has somehow slipped the cambelt by a few notches. Exhaust valves all look fine.

It has the 190 kit fitted - as a matter of interest how do you accurately time the inlet camshaft up with the sprocket timing marks?

Cheers

Simon

5

You should find a new timing mark machined onto the rim of the pulley a good few teeth round from the original. This should be lined up with the marks on the exhaust pulley. to ensure it is correct I would measure the lift at TDC before starting the engine, you should have values of 120-130 thou on the inlet and 105-110 on the exhaust.

Dave

6

Many thanks Dave - will check tonight

Simon

7

No mark Dave, but your valve lift advice nails it - big thankyou

Simon

8

Now back up and running like a good un :slight_smile:

9

Good news Simon… now go out & celebrate with your wives! :wink:

10

LOL Mr P, tell you what Exige is the most fickle mistress - I love fickleness :slight_smile: