Mi16 Timing

[chris 417 mi 31 2 Cars]

Ok my head is back on my block but the mechanic who is fitting it was slightly unsure of the correct way to time the engine up. At the moment he's left all the pistons at mid point so they are all sat level, im guesing we will probabaly have to remove the cams to set this up properly ?

 

Any suggestions on timing settings too ? catcams 4900521 cams in the head

[petert 560]

Fairly straight forward really. Fit the standard pulleys first and locking pins to roughly get the cams in the right position. Then remove the standard pulleys and fit vernier pulleys and time them as per the specs. on their website:

 

inlet - 2.7mm lift @ TDC

exhaust - 2.4mm lift @ TDC

[chris 417 mi 31 2 Cars]

so the pistons are ok where they are ?? ( all sat level ) and we can just time the cams up to those settings without having to put the pistons in a different position ? ( the pin on the crank pulley is 180 degrees out btw from the lock off hole )

[Anthony 1,000]

Well, you'll need to accurately find TDC (top dead center) of piston #1 and time the cams up from that to the above figures, obviously on the inlet stroke for the intake cam, and the exhaust stroke for the exhaust cam.

 

I'm sure if you do a search on Google you'll find a suitable guide showing you how to do it

[petert 560]

When you insert the three timing pins, it locks the pistons at 90 deg. BTDC, or halfway up and halfway down. Where it is now. However, you could be 180 deg. out on the crank locking pin.

 

Timing cams using the TDC method requires a dial indicator gauge, and knowledge on how to accurately find TDC. If your mechanic doesn't have the tools, and/or doesn't know how to do it, I suggest you find another mechanic!

 

The alternate is to use the lobe centre angle method ie the angle after TDC when the inlet valve is fully open. In your case 110 deg. from memory. This is even more difficult to do properly but is more accurate, as some cams aren't symmetrical. ie the opening side is different to the closing side.

[chris 417 mi 31 2 Cars]

dont get me wrong he is good ! he just hasnt worked with this engine before (used to mark 2 escorts and lancia delta integrales )

 

So basically best bet would be to remove the cams, lock the crank pulley off at tdc, then time it up from there !

Edited May 23, 2007 by chris 417 mi