Engine timing belt replacement

[alia176]

Originally Posted by lhopp77

The cam sprocket arrow should actually be pointing straight up when the cams are properly aligned.

LISTEN to the experts or don't bother to ask advice.

Lee

That's what the FSM and I've saying all along, sprocket arrow points straight up when properly aligned.

[lhopp77]

Originally Posted by alia176

That's what the FSM and I've saying all along, sprocket arrow points straight up when properly aligned.

YES,BUT.......align with the marks NOT the arrows. Mark alignment is much more precise than trying to get the arrows straight up by eyeballing.

Lee

[alia176]

Originally Posted by lhopp77

YES,BUT.......align with the marks NOT the arrows. Mark alignment is much more precise than trying to get the arrows straight up by eyeballing.

Lee

Agreed. The arrow WILL end up in the proper orientation once the notches are lined up. It's a beautiful thing.

[SoCal LS-L]

Yeah its much easier to see on yours anyways since the timing cover marks AND cam gear marks are highlighted white. The belt lines are purely aesthetics, you can line em up if you want but its just another step, and not necessary. The main thing is lining up the right marks and making sure they stay that way as you reinstall the upper idler gear and tension the belt.

Did you by chance get a new water pump while you're that far in?

[alia176]

Originally Posted by SoCal LS-L

Yeah its much easier to see on yours anyways since the timing cover marks AND cam gear marks are highlighted white. The belt lines are purely aesthetics, you can line em up if you want but its just another step, and not necessary. The main thing is lining up the right marks and making sure they stay that way as you reinstall the upper idler gear and tension the belt.

Did you by chance get a new water pump while you're that far in?

Agreed, wasn't trying to be argumentative with you but just wanted to make a subtle point.

I'll do the water pump as well as other stuff "while I'm in there". The intake manifold is off and soaking in solvent. I'll do my best to clean the runners and start sourcing the usual hoses and such. Embarrassingly, all parts have been on the shelf for four years but finally found the time to do this. Unemployment does afford one lots of time to play catchup!

I was gonna pull the engine out but knowing me, this would've pushed the cost higher (valve job, head milling, injector clean/balance, bearings, etc)

I did take some pics of the process so far and will start a new thread in case others want to see what's involved with the intake removal. It truly is a royal PITA!

Thanks for the help.

[StelthSvx]

Im in the same boat with timing belt change....I decided to pull my engine and do a reseal/clean up.

QUESTION: On a properly timed engine, will the timing marks on the cam sprockets BOTH always correspond ; ie If left cam sproket is ON timing mark the right cam MUST be on ITS mark also........I have yet to get my crank pully off to check TDC but as it stands my cams seem off....Car died on me a few weeks ago and i suspected jumping some teeth on belt....

[SoCal LS-L]

Originally Posted by StelthSvx

Im in the same boat with timing belt change....I decided to pull my engine and do a reseal/clean up.

QUESTION: On a properly timed engine, will the timing marks on the cam sprockets BOTH always correspond ; ie If left cam sproket is ON timing mark the right cam MUST be on ITS mark also........I have yet to get my crank pully off to check TDC but as it stands my cams seem off....Car died on me a few weeks ago and i suspected jumping some teeth on belt....

On a properly timed engine, yes. This has happened to me once, the pass side cam jumped 3 teeth while the crank and driver side cam were properly timed. A dust seal on one of the idlers had popped off and was caught between the belt and cam gear, making it skip a few teeth. The car immediately died and wouldnt start. When I looked at the driver side cam and crank timing markers, they were right on, but the pass side timing had skipped too far to run the engine.

TDC your crank and check both cams, you dont have to pull off your crank pulley to check either, it has a TDC mark as well. Any one of the three can jump timing individually so just make sure you see all three at the same time while TDC'd to eliminate that as a possibility.

[StelthSvx]

also to add to the above discussion......alinging timing belt marks when installing new belt is a check step..ie when u line up Crank and Cam marks there should be 53?(ithink) teeth between cam time mark and crank time mark. the t-belt marks are -----I----(53teeth)--I-----(53teeth)------I----.
Now if last tech just aligned marks and threw on belt thats fine but you cant use them as a reference when checking belt timing.....pics of engine reseal progress to come!!!!

[SoCal LS-L]

Originally Posted by StelthSvx

also to add to the above discussion......alinging timing belt marks when installing new belt is a check step..ie when u line up Crank and Cam marks there should be 53?(ithink) teeth between cam time mark and crank time mark. the t-belt marks are -----I----(53teeth)--I-----(53teeth)------I----.
Now if last tech just aligned marks and threw on belt thats fine but you cant use them as a reference when checking belt timing.....ps of engine reseal progress to come!!!!

After the initial installation, the lines on the belt will not line up with the timing marks again unless its been a perfect X amount of engine revolutions. It wont matter if the last tech aligned the belt marks with the timing marks or not.... it just matters that the timing on the cams and crank were aligned and checked prior to re-installing everything.

[redlightningsvx]

This job is really easy and straight forward. Why all the questions!!!!!

[StelthSvx]

The crank is lined up with timing mark....note both cams off timing mark....sO looks like belt jumped. I found a couple pieces of chewd up oily timing cover gasket inside cover.

[boipeba]

My cruise control has been working fine until today. I was driving and tried to set the cruise, but no luck. The light on the button is lit, but the lever doesn't preform its function. I checked the fuse both in the drivers side compartment and any possible fuse in the engine compartment but all is good.

Any ideas or comments? Other than that, car is running great.

Boi.

[SoCal LS-L]

Originally Posted by StelthSvx

The crank is lined up with timing mark....note both cams off timing mark....sO looks like belt jumped. I found a couple pieces of chewd up oily timing cover gasket inside cover.

Yep anything between crank/cam gears and the belt is enough to jump it, I can attest to that. Ohhh how easy it looks with the engine out of the car in a warm garage, as opposed to in a parking lot at night while its snowing

EDIT: WAIT, just noticed in your other pics you're using the timing belt marks to determine if your belt jumped. Use ONLY the notches to determine timing correctness.

[SoCal LS-L]

Originally Posted by boipeba

My cruise control has been working fine until today. I was driving and tried to set the cruise, but no luck. The light on the button is lit, but the lever doesn't preform its function. I checked the fuse both in the drivers side compartment and any possible fuse in the engine compartment but all is good.

Any ideas or comments? Other than that, car is running great.

Boi.

In a thread about timing belt replacement .........?

Must be a blown head gasket, better get that fixed before your wipers dont work........

[michael]

Originally Posted by boipeba

My cruise control has been working fine until today. I was driving and tried to set the cruise, but no luck. The light on the button is lit, but the lever doesn't preform its function. I checked the fuse both in the drivers side compartment and any possible fuse in the engine compartment but all is good.

Any ideas or comments? Other than that, car is running great.

Boi.

Check the vacuum hose on the cruise control thingie on the firewall behind the TB.