Author Topic: Cam Gears (Read 6268 times)

KenC · « **Reply #15 on:** September 01, 2008, 11:48:21 PM »

Your chain is slipping? How?

ob_318is · « **Reply #16 on:** September 02, 2008, 10:14:20 PM »

Truthfully I have no idea...but after I TDC everything, and start the engine it either starts and I have to rev it to stay on, or the car dies...then it wont start after that. Or it starts and if I rev it....it dies...and wont start again. So, I am guess the timing keeps going bad, so the chain is slipping..

KenC · « **Reply #17 on:** September 02, 2008, 10:55:22 PM »

Quote from: ob_318is;55912

Truthfully I have no idea...but after I TDC everything, and start the engine it either starts and I have to rev it to stay on, or the car dies...then it wont start after that. Or it starts and if I rev it....it dies...and wont start again. So, I am guess the timing keeps going bad, so the chain is slipping..

You're sure it's not a lack of spark or fuel?

vagrant_mugen · « **Reply #18 on:** September 03, 2008, 10:48:58 AM »

my sprockes WILL be getting changed:

ob_318is · « **Reply #19 on:** September 03, 2008, 04:55:31 PM »

Quote from: vagrant_mugen;55956

my sprockes WILL be getting changed:

1. If you adjust those bolts on the sprocket (4 slotted bolts), I am guess it advances your timing, or retards your timing...depending on which way you turn true?

2. If you change your sprockets, then you will be removing those bolts, so do you have to remember the mark and set back properly?

vagrant_mugen · « **Reply #20 on:** September 04, 2008, 12:06:41 AM »

1.) thats correct. TRUE

2.) yes, i must put the new sprockets back in the same spot as the old ones.

but im gonna mark the camshaft right under the timing arrow on each one, and put the new sprockets on those marks. shouldnt be too terrible.

cheesebox · « **Reply #21 on:** September 04, 2008, 02:38:37 PM »

IMO The main reason for changing the sprockets would be to reduce noise, especially the zizzing sound commonly heard around 3000rpm. If you're doing it for that reason you'd do well to change the chain guides and tensioner as well.

I changed all but the idler gear, as it's not driven and doesn't drive anything. I have heard though on higher mileage engines, the casting which supports the idler can suffer cracking. Worth checking while you're in there.

As for a chain slipping, that would have to be some seriously worn sprockets or guides!

KenC · « **Reply #22 on:** September 04, 2008, 04:38:59 PM »

My thoughts exactly re: the slipping/tooth jumping. With my new rails/guides and tensioner, there is no way in hell it could jump a tooth.

Quote from: cheesebox;56033

IMO The main reason for changing the sprockets would be to reduce noise, especially the zizzing sound commonly heard around 3000rpm. If you're doing it for that reason you'd do well to change the chain guides and tensioner as well.

I changed all but the idler gear, as it's not driven and doesn't drive anything. I have heard though on higher mileage engines, the casting which supports the idler can suffer cracking. Worth checking while you're in there.

As for a chain slipping, that would have to be some seriously worn sprockets or guides!

Jtuner · « **Reply #23 on:** September 15, 2008, 05:43:37 PM »

Quote from: ob_318is;55843

I have been having the same timing, chain slipping problem...I put everything back together and TDC everything. On start car idles then dies, what ever the case seems like the chain keeps slipping, all parts look good...but everything looks good covered in oil. Anyone in the tri-state area good with m42 timing etc., and willing to replace all parts form

Did your woodruff key on your crankshaft fall out when you replaced the sprocket?