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Discussion Starter #1
has anyone ever heard of a bad saab engine. especially the T16.

i've run into a problem that even the local saab specialist doesnt understand. My inlet cam will not line up with TDC. infact the closest it will line up is 14 before TDC. no matter how much we've tried pushing and pulling, using up the play in the sprockets it will not line up. the exhaust cam lines up perfect.

booth my old sprockets and new scan tech ones give the same error.

before i started working on the engine i saw that there were differencs in the cams line up.

im stumped. and im going to have to put another engine in. what a waste of money. :x
 

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Discussion Starter #3
well its not impossible. i havent got another cam to compare it to unfortunatly. but i have bought another T16 engine to use in the mean time, it might be worth taking the cams off that and trying.
 

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JimmyG said:
has anyone ever heard of a bad saab engine. especially the T16.

i've run into a problem that even the local saab specialist doesnt understand. My inlet cam will not line up with TDC. infact the closest it will line up is 14 before TDC. no matter how much we've tried pushing and pulling, using up the play in the sprockets it will not line up. the exhaust cam lines up perfect.

booth my old sprockets and new scan tech ones give the same error.

before i started working on the engine i saw that there were differencs in the cams line up.

im stumped. and im going to have to put another engine in. what a waste of money. :x
What's been done to the engine to get it to this stage where what was fine for years before now isn't?

I presume you've changed the chain, cam sprockets? You've swapped the sprockets and still out - OK, it's not them. Have you changed the cams?

There was a "difference" in the cam lineup before - did you mark it or note it? The engine was obviously happy with that difference.

Even assuming there is some really odd change in the way it went together since before - why change the whole engine? Surely just a head swap would suffice?
 

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Sounds almost like you're off a tooth on the sprocket / chain - how many teeth are on the cam sprocket? I believe it's 38 - correct me if I'm wrong. If I'm correct then the arc between the teeth would be 9.47 degrees - pushing and pulling the "slack" won't correct having the initial sprocket position correct prior to putting the chain on, you're out of phase about 4.53 degrees - which probably would be available within the tolerance of the whole assembly.

Just thinking out loud -

Steve
 

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the family 1993 had a cracked block from factory...and just about everything else went wrong...save for the cams. It was a 900s 4 door though.

wow, sorry for not helping you out at all. Any luck yet? Man, I wish i could just buy a T16 and drop it in...for the weekend at least :cheesy:
-Alex
 

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JimmyG said:
i've run into a problem that even the local saab specialist doesnt understand. My inlet cam will not line up with TDC. infact the closest it will line up is 14 before TDC. no matter how much we've tried pushing and pulling, using up the play in the sprockets it will not line up. the exhaust cam lines up perfect.
Is the specialist Bill in Bonnybridge? If it is and he can't figure it our you're ****ed.
 

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Discussion Starter #8
thanks for the help all.

toomany2cv's -
What's been done to the engine to get it to this stage where what was fine for years before now isn't?

I presume you've changed the chain, cam sprockets? You've swapped the sprockets and still out - OK, it's not them. Have you changed the cams?

There was a "difference" in the cam lineup before - did you mark it or note it? The engine was obviously happy with that difference.

Even assuming there is some really odd change in the way it went together since before - why change the whole engine? Surely just a head swap would suffice?
sadly i didnt note the positions prior to taking the engine apart. i didnt think i'd run into this problem and thought i'd be throwing the old gear away:roll: i cant remember if it was the exhaust or inlet cam that was out before i took the engine apart, but the car always had a slight miss. is was never perfect.

I've rebuilt the complete timing including the bottom sprocket. then things like valve stem seals and crank seals.

I've yet to get hold of a set of cams. i dont think i'll be buying them new. lol!

I asked the local saab breaker here for a quote on a cylinder head. "£250 please" :nono; whereas i can get a complete engine for £80, what i sold it for to Bawheid :p luckly he has no use for it now.

Stevethefolke
Sounds almost like you're off a tooth on the sprocket / chain - how many teeth are on the cam sprocket? I believe it's 38 - correct me if I'm wrong. If I'm correct then the arc between the teeth would be 9.47 degrees - pushing and pulling the "slack" won't correct having the initial sprocket position correct prior to putting the chain on, you're out of phase about 4.53 degrees - which probably would be available within the tolerance of the whole assembly.
This is what it the problem actually looks like. but its impossible as there simply isnt enough slack in the chain to get another tooth. unless i've done something wrong but im sure you dont have a tooth slack on the top "bridge" between the 2 cams. simple because this is the "tense" side of the chain and will the chain will just jump sooner rather than later!?! correct? i've got this "bridge" completly tight, which is why i cant get another tooth from the inlet sprocket. :(

nnamssorxela -
the family 1993 had a cracked block from factory...and just about everything else went wrong...save for the cams. It was a 900s 4 door though.
LOL - saab has just been defined :eek:

thanks for all your help!
 

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Discussion Starter #9
Albert Trout said:
Is the specialist Bill in Bonnybridge? If it is and he can't figure it our you're ****ed.
yup. Its bill and indeed he couldnt get inlet any closer!! :roll: :evil:
 

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this might be garbage but, are the 2 cams machined the same?? as if what 2 cv's was saying, or steve re cam lining up if they are odd paired cams and someone has put a left hand into a right hand side at some time,???it has never run right since they did it.there might only be a small difference from one cam to the other but?? i have never had cam problems but just thinking out loud, i also originally thought it might be a tooth out, just lined up wrong, but a replacement head would be already set up to put straight on, and get rolling.
 

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16saabs said:
this might be garbage but, are the 2 cams machined the same?? as if what 2 cv's was saying, or steve re cam lining up if they are odd paired cams and someone has put a left hand into a right hand side at some time,???
Would it run at all with a pair of inlet cams or a pair of exhaust cams in?
 

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What I'm saying is that the cams are out of phase - you've got three sprockets in the system, correct? You've got two cam sprockets (one inlet, one exhaust) and one crank sprocket. The chain and the number of teeth on each sprocket are constants, but until the chain has "joined" the sprockets, their position is variable, not constant. If you were to hold the (for example) inlet cam at TDC but allow the exhaust cam to rotate 9.5 degrees BEFORE you put the chain on (and that's a pretty small rotation) you'd "lock" the cams out of phase - it has nothing to do with the number of links between the sprockets at the "bridge" - physically this is a constant (unless you've got a way to maintain a "sagging" condition) - I mean the relative rotational position between the sprockets at the time the chain was installed - that's what I think may be off.
 

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It sounds like you are 1 tooth off on the intake cam.

1. Remove intake sprocket cam bolt.
2. remove sprocket from the cam.
3. Carefully remove and rotate the sprocket one tooth clockwise.
4. Spin cam to line up with sprocket.
5. Attach the sprocket to the cam
6. Check marks.

It should be lined up now.
 

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Discussion Starter #14
jefspg said:
It sounds like you are 1 tooth off on the intake cam.

1. Remove intake sprocket cam bolt.
2. remove sprocket from the cam.
3. Carefully remove and rotate the sprocket one tooth clockwise.
4. Spin cam to line up with sprocket.
5. Attach the sprocket to the cam
6. Check marks.

It should be lined up now.
why i didnt think of this i dont know!!!! :roll:
It'll be getting tried tonight.

Steve, i see this is what your saying too now.

I hope this is whats wrong.

cheers.
 
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