4 replies to this topic

[Surfbluegarage]

please help i put my kent 266 cam in yesterday not for the last time but just to mock up on timing. my dad helped me and we timed it this way..
We turned the crank to TDC then put a pushrod down into number 2 valve hole (dont know the proper name sorry).
We then turned the camshaft till we got max lift on the inlet lobe and left it where it was.
Then we put a kent timing disk onto the crank and my dad sed to turn the crank round 106 degrees (it sez 106 is inlet max lift point in kent booklet) so we did it. Me not knowing any wiser at this point didn't know what we were doing as ive never done this before.
Anyway.. we turned it and took off the timing disk and marked the 2 cogs on the duplex timing kit. Then i lieft to go to the pub.. on my return my dad had put the chain on the 2 cogs but when i turned the engine over i noticed that as i was turning it round the dots became very close.. then wen id stopped the dots were back to dot to dot timg.. what have i dont rong???

[minipip]

theres a how-to guide in minimag this month if thats any help?

[Surfbluegarage]

aahh thank you!!! when was it out and is it mini mag or mini world?

[Ethel]

You need to put your timing disc on with the crank at tdc and set up a pointer to indicate zero THEN turn the crank to 106 degrees and find max lift on your inlet valve. You then fit your timing gear with out moving crank or cam.

The trick is to be accurate in establishing tdc - to do that use your dial gauge to establish when the piston is the same short, but obvious, distance down the bore either side of tdc. Mark both of these points on your timing disc et voila tdc is bang on in the middle of that angle. You can do the same with your cam as long as it's not some sexy asymmetric profile.

[dklawson]

As Ethel said, your sequence is a bit out.

Start by putting the timing disk on the crank. Make and attach a pointer to the block so you can measure the degrees you turn the crank. The degree wheel position at this point isn't critical. Turn the crank looking for TDC on number one piston. You don't make a single measurement, you turn the crank back and forth around TDC (clockwise and counterclockwise) noting where the dial indicator starts to show the piston moving down when you turn clockwise, and when you turn counterclockwise. You record and average these degree values, then turn the crank so your pointer aligns with that average degree number, then RESET the degree wheel so that its zero (0) marker lines up with your pointer. Make one last check by turning the crank CW and CCW to confirm you've accurately found #1 TDC.

Once you've accurately found TDC, then you move on to measure the cam's max lift. You should find that this occurs within about 3 degrees of what the cam's specs say it should be. Once you've found this value you either accept it as something you can live with or you invest in offset keys for the cam gear to tweak the timing, or you invest in the adjustable cam timing pulleys.