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1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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partschanger123
Novice
May 1, 2011, 8:20 PM
Post #1 of 13
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1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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I have replaced timing belt ,am not sure of timing, it won`t start. I have done compression test it is okay, Has good fuel pressure,and spark. Any ideas?
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Mr.scotty
Enthusiast
May 1, 2011, 9:14 PM
Post #2 of 13
(3408 views)
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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You already answered you own question.
The timing is off.
Get a repair manual for the book or search around and see if you can find a pic of the timing marks.
Don't keep trying to start the engine untill you know it's back in time.
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Your only as good as your tools!
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partschanger123
Novice
May 1, 2011, 9:51 PM
Post #3 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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Thanks for the reply, I have the book , it shows the timing marks, and says if there are no marks to put them on myself. Sense the belt was already broken and out of time I am unable to do that. I also went to parts-house to buy new belt sprockets or at least see where the marks are supposed to be, it seems to be a dealer item so that may be my next thing to do unless someone can tell me how to line them up without marks. I am also concerned there may already be damage sense the engine was running when it broke.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 2, 2011, 5:32 AM
Post #4 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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You have bitten off more than you can chew on this one. This engine requires a special set of tools and some in depth understanding of the engine to be able to set the timing. Not only does is not use timing marks but the banks time at opposing crankshaft rotations.
http://www.sjdiscounttools.com/otc6045.html
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Mr.scotty
Enthusiast
May 2, 2011, 10:49 AM
Post #5 of 13
(3389 views)
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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Now if his belt didn't break and he was just replacing the belt and he locked the cam gears and didn't touch the crank gear everything would have stayed in time rite?
This is why i won't let a timing belt go over 70,000 miles cause it's much easier to replace a belt thats not broke.
And anytime i buy a car (used) i replace the belt unless i have proof of when someone last did it.
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Your only as good as your tools!
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Hammer Time
Ultimate Carjunky
/ Moderator
May 2, 2011, 10:54 AM
Post #6 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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No, that is not how this car is timed.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Mr.scotty
Enthusiast
May 2, 2011, 10:55 AM
Post #7 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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I wonder why GM made it without any timing marks?
That's not there best Idea.
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Your only as good as your tools!
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Hammer Time
Ultimate Carjunky
/ Moderator
May 2, 2011, 11:16 AM
Post #8 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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Scotty, this is getting old. You have no idea about how this engine works and you are just muddying up someone else's question so if you want to sit back and read, fine but stop hijacking other peoples questions.
This engine is set up this way for a reason. As I already stated, the banks are not timed simultaneously. The cam gears have no keyways and can be installed at any position. I'm not even sure how he got this engine at all since it wasn't used in any 1990 Pontiacs. It was used in 91 to 96 Grand Prixs
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Mr.scotty
Enthusiast
May 2, 2011, 11:24 AM
Post #9 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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Ok, I stop making the place a mess with my 4 post. lol
Thanks for replying though, i learned something!
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Your only as good as your tools!
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partschanger123
Novice
May 2, 2011, 7:02 PM
Post #10 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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Thanks for the info The 1990 was a typo, it is a 91. One of the idler pulley bearings went and caused the belt to break, I normally change it every 80,000 miles. There is no key-way or timing marks. I may need to buy a better book, such as a Hiel. I guess I`m asking to much for a forum.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 2, 2011, 7:04 PM
Post #11 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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You can't do it without the tools.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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partschanger123
Novice
May 2, 2011, 8:34 PM
Post #12 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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Thanks for the reply, the book I have tells me the tools I will need. They don`t appear to be anything that I can`t substitute what I have for. They just don`t tell me exactly what I need to do with them.
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Hammer Time
Ultimate Carjunky
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May 3, 2011, 4:11 AM
Post #13 of 13
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Re: 1990 3.4 pontiac broke timing belt no timing marks. how do I set cams(4)?
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on May 3, 2011, 4:14 AM)
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