Question about 1995 Chevrolet Lumina

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3.1 v6 when replacing the timing chain I turned the cam into position but the crank comes to a dead stop. Is this an interferance engine and if so do I have to turn the cam to a certain position to turn the crank?

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Rotate the cam on position and move the crank where it needs to be and rotate the cam back where it should be. This way you're getting the valve out of the way so you can get the piston where it needs to be.

Posted on Jul 03, 2008


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3 Answers

It seems to me that if the belt breaks , even on an interference engine: the valves will slam shut . Maybe it 50/50 chance either way.

belt has to be replaced any way
compression test on the cylinders.. tells you straight away
zero or low compression numbers ..valves bent

in an interference engine OHC or DOHC belt breaks
the cams stop dead and pistons continue to move up and down

non interference there is a gap between pistons and valves



Oct 31, 2016 | Cars & Trucks

1 Answer

Just anted to confirm that my 2005 buick rendezvous has a non interference engine as i need to replace the timing belt/chain and was concerned with driving it

you need to say what engine it has ( 4,v6,v8)
a qualified mechanic always treats an engine as intereference fit regardless because either engine can have valve damage when the failure occurs
If you have not broken a belt or chain and you set the timing marks up properly before removing the belt or chain and do not turn crank or cam/s after the belt/chain is removed there will be no damage done
that only occurs when the crank is or cam/s are turned without the connection to each other

Jul 01, 2016 | 2005 Buick Rendezvous

2 Answers

Passing smog

I doubt it as you have stated that it shows a calibration fault . This will be from the variable valve timing assembly on the cam shaft/s that is altering the valve timing. The timing chain may be faulty but you should be hearing it to be that bad.

Apr 03, 2014 | Volkswagen Jetta Cars & Trucks

1 Answer

Can some one show me timeing mark on 1997 nissan maxima please

wow a Nissan Camry.
what engine, ??????????
what are you doing, we dont know. so..
cam marks? chain marks?
spark timing?

in 1997, most cars have 6 or more marks.

Nissan V6? is it (guessing i am)
if doing major cam work , you will need far more that just mark data.

if doing serious work, i recommend the below
  1. a real FSM, from NISSAN if Nissan.
all nissan engines are All Interference
so doing cam work or finding engine dead,
do a leak down test by hand before cranking engine
or bend the valves.
after replacing chain, do a cyl. leak down test (a tool)
and if it fails, the valves were bent, do not crank engine
or the damage WILL cascade $$$$$$$$$$$$$$

Feb 22, 2014 | 2006 Toyota Camry

1 Answer

1996 dodge ram 1500 v6 interference motor

the book says do not turn crank with cam chain disconnected-- so --yes ---it is an interference motor and if you turn either with out the cam you will bend valves.

Jan 02, 2014 | Cars & Trucks

4 Answers

2001 Ford Ranger 3.0L V6 Timing Chain Issue

if the quote was ridiculously high
the mechanic didn't want the job

you could take the rocker covers off and check the cam chain timing marks

first picture is the crank chain of that engine heavy duty one
front of the motor ......take a few things off
remove timing chain cover
and there is that one
second picture
there are chains kits for the cam shafts

as for engine not turning over

if motor is stuck solid and no movement back or forward
on the crank
oil pump may have failed and seized the engine

mechanic would be right
the original engine rebuild will be expensive because of the internal damage

if that is the case source a used motor and drop that in




Apr 30, 2017 | Cars & Trucks

1 Answer

I am rebuilding the 2.3 in an 2005 mazda tribute. How do I synchronize the crank with the cams ? There is no keyway on the balancer

If you have the cylinder head off it is easier to do but with the head on, put the balancer on and make a reference mark on it to the crank snout, then use a long bolt the exact size of the sparkplug threads, threading it into the #1 cylinder. Turn the engine slowly by hand 'till the bolt stops the piston.(be careful that the bolt does not interfere with valves) Make a reference mark on the outside of the pulley and a reference mark matching that position on the block. Turn the crank backwards till the bolt again stops rotation. Make another mark on the pulley in the same place the block mark is at. The halfway point between the two pulley marks is exact top dead center. You can then make another mark at the halfway point, remove the bolt and turn the new mark so it aligns with the block reference. At that time, the piston is at tdc and any mark you put on the pulley can be referenced with a corresponding mark you place on the block for permanent reference will always be tdc, probiding the first reference you made on the pulley and crankshaft are kept in alignment.
Once the crank has been indexed, you can set up cams, following timing chain replacement instructions in your manual. Once this has been completed, turn the engine four complete revolutions by hand and re-check your index points. There should be no valve interference or other binding, and all index points must align properly. What I've described is making a "poor mans" degree wheel. You can buy an actual degree wheel in most speed shops, and also information on using it, as well as performance setups that take advantage of changing the performance curve of your engine by changing crank/cam relationships. You may find some of that interesting and informative!!!

Aug 02, 2009 | 2005 Mazda Tribute

3 Answers

Installed new timing chain but car wont start

What the last person said with the additional comment that being even one tooth off can cause it to run bad or not start. I prefer making marks on the gears and chain or belt- whichever you have and transferring the marks by teeth counting to the new belt or chain- fool proof. Did you rotate either the camshaft or crankshaft with the timing chain removed? If your engine is not a zero interference engine than you may have damaged the internal parts. Even on some zero interference engines, you can damage the camshaft by rotating it backwards. Your timing is just plain off or you may have damaged the engine. Sorry, don't know if your is a zero interference or not- I think most are not. I know my Miata is and my Eclipse was not. If it is not a zero interference engine and your marks are way off on your timing- just go ahead and save up at least the money for a new head and send it to mechanic. If it is a zero, and your marks look on- see if the interpretation of the mark could possibly be 1 tooth over on either the cam or crank. Make you go blind staring at it that intently and u can make mistakes.

May 12, 2009 | Infiniti G35 Cars & Trucks

1 Answer

3.1 tming chain

There are alignment marks on the timing set,and before you remove the old timing set,you must get cylinder number 1 in the firing order to Top Dead Center....then you can remove the old,and reinstall the new,timing set,but pay careful attention to the marks on each gear,in relationship to each other and where they line up.The new timing gear and chain set should have directions on where they are to line up,if not,you need to buy a Chilton manual for your specific car,as i don't have the specific information for your 3.1 engine.It sounds like your timing is WAY off,and when rotating the crank,a piston is hitting a valve...that means it's WAY out of not start the engine until resolved.The camshaft actuates the valves in relation to the crank and pistons' position,and when the valves open or close is VERY important for the engine to run properly,this is what i'm talking about (phased in) correctly.

Jul 27, 2008 | 1995 Chevrolet Lumina

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