SO I did my timing after the shop f** it up. I aligned all timing marks properly as indicated then i rotated it manually. They do not seem to line up anymore.. Tension on chain is ok and it doesnt seem to be jumping teeth or anything. Is there a something i am doing wrong or is there a number of revolutions where they will line back up? Thanks for you feed back!

 

just gotta play with it till they all line up. Once they all line up, tighten the chain and id try rotating the the crank pulley to make sure everything clears. If after a few revolutions nothing comes in contact, you should be timed, so long as you also have the marks on the chain, cams, and crank lined up correctly too.

 

Yes That is what I did. Lined up everything and rotated the crank pulley manually. After a few turns nothing come into contact but they do not seem to line up anymore. The chain is already tight. Does this mean the timing is off again?

 

it takes quite a few rotations for all the marks to line up again. if nothing comes in contact after a few turns you should be fine. if you want peace of mind you could just keep cranking it till they line up again. lol. takes a minute.

 

it's either 42 or 46 revolutions on the crank before they line up again.

 

Once u set timing, and spring the tensioner, it is ok the marks don't line up after manually rotating the crank.

As Area47 mentioned, it will take quite a few rotations to get them lined back up.

On the LSJ, as long as the exhaust cam gear is at 10 o'clock and the intake cam is at 2 o'clock with piston #1 at TDC compression stroke u r good to go.

I know the LNF has cam actuators on the gears, so not sure how it pans out.... should be about the same.

 

Thnsks a lot. Ill finish it tonight. And let you know how it goes

 

Sounds good!

I just timed my car last week after installing cams and valve springs.

Everything is still fresh in my head.

 

The LNF VVT is different. You really should invest in a workshop
Manual and the VVT retaining tool. Once the marks are set up you wind the chain onto the inlet cam the crank gear and then the exhaust cam. As you do so the crank gear moves. It drives you crazy. And for sure rotating the assemble is a pita. That's why the manual and the tool is such a smart investment. Ced have the manuals the tool is 25 bucks on eBay. Good luck

 

Thanks John!!

I wasnt sure if it was different from the LSJ.

Sounds like a pita.

Regardless, if he got it timed right, he should still be ok if the colored timing marks on the chain don't line up after rotating the engine by hand a few times.

 

If the timing chain is misaligned, the best that can happenm the vvt acutator solenoids wont park /you set a code/ the car limps. Worst case you bend all the valves... its really best to spend a little more to gain a lot. Pool resources maybe ?or have some one scan the relevant pages out of the manual...Purchase and then pass around the service tool? Or pay a good indie shop to do it, heck maybe even a decent dealer?

 

That was good one, John.

 

Hey guys been really busy and haven't had time to post. So I did the timing already. My cobalt still idles like crap and I'm getting a p0016 code. There's also a flutter at the turbo. If I rev the engine above 1k rpms the engine seems fine. Any ideas?this is starting to really p!!@@?% me off!!

 

the timing i suspect is still wrong. Manual/ tool/new chain/correct procedure = good result. Hard words, but its what I find in cases like these...

 

I also read something about crank case relearn after engine rebuild. Is this necessary for lnf or applies to the lsj?

 

should not be required for either.

 

Where can I download or buy the book for the lnf?

 

Crate engine depot...

 

Ok new info... I swapped the the camshaft position act valve, exhaust and int, with some other two.. Idling roughness is down I'd say about 95%. Car runs fair... Still haven't broken in new engine. My original cam pos actuators were really dirty with metal shavings. Should I still take it apart to check timing or can we rule it out?

 

does it still have a CEL? GM recommend numerous oil changes if there is debris on the actuators. I am not 100% you have the cam timing right. BUT if there is a pending CEL for P0016 it will come back, and the longer you run the car , it will eventually move to" limp home". If the timing is off a little , it will still run, it wont hurt it, but you do need to make sure you have a new chain on it . That has bitten me in the past on LNF rebuilds. And debris is never good to find in a rebuilt motor.

Good luck.

 

There aren't any codes. But I'll keep an eye out. Thanks a lot I appreciate you have been of great help!!

 

No codes? You are golden!

 

What is the book listed under? having trob finding it?

 

email Tom@crateenginedepot.com. He has a separate site for manuals.

 

I have PDFs of the manual. I can send various sections via Email