292 Inline 6 not running properly. Possible broken cam gear. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-24-2012, 09:43 AM
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292 Inline 6 not running properly. Possible broken cam gear.

My Chev inline 6 has become hard to start. (turns over hard). Vacuum is down on 3/4 cylinders, and way down on 5/6 when it is running, backfiring through 5/6 as well. It was running OK then started this suddenly. Checked the static timing and its ok. My guess is I have broken a tooth on the cam drive gear. I have never had the pleasure of changing that gear, can someone give me an idea about the repair procedure? Can this be done by the backyard mechanic?

Thanks

Carl

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Old 05-24-2012, 10:08 AM
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broken gear......

Hi,the toughest part of that repair job,is removing the oil pan,to access the timing cover bolts.
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Old 05-24-2012, 10:14 AM
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Cam Gear on inline six

Hi Carl replacing the cam gear on a chevy inline six is pretty easy but plan on having the vehical down for a couple hours at least id recomend replacing the cam,crank and timing chain all at once with all the seals needed you can get a timming seal kit that will give all the seals to do this job right.You will have to remove the harmonic balancer from the crank so you need a puller to remove the balancer and crankgear the job pretty much is removing the front parts from the engine getting out of the way the water pump the belts ect to get to the timing chain assembly you may have to take out or loosen some of the oil pan bolts as well. I hope this helps you Carl
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Old 05-24-2012, 10:49 AM
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Broken cam gear replacement

OK thanks for the encouragement but I made a few images to post to the document to detail what is going on. When I started down this road with the inline 6 for my car I anticipated problems and bought a load of spare parts for the engine, especially in areas of known weaknesses. One of these difficulties was the fibre cam gear, which is known to shed its teeth.

First off I want to post some pics with this thread. HOW on earth do I do this????

Thanks guya
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Old 05-24-2012, 02:22 PM
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It's been a very long time since I've worked on any GM 6 and especially the 292, am interested.

Now, as far as posting photo - for me, it's to use my freebie Photobucket account, copy and paste picture. Another way is to scroll down to where its says Manage Attachments, click on it then click on the photo you want to post in your photo album. The bad part with this is you will only post thumbnails that viewers need to enlarge. Those are permanent while a Photobucket posted picture will disappear if you delete or otherwise change anything there. There are other ways, but these are the only two I use
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Old 05-24-2012, 05:12 PM
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Quote:
Originally Posted by 27TRoadsterguy
Checked the static timing and its ok. My guess is I have broken a tooth on the cam drive gear.
Carl
I dont see why the cam gear tooth being broken off would cause a driveability issue. If you checked the static timing,and it is OK that would mean the cam is in time... Correct?
I would back off all the rocker arms ( valves) , sight down the stems to see if there are some bent ones, then air charge the cylinders to check for valve leaks, ring leaks, or head gasket leaks. I would bet on the head gasket myself.
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Old 05-24-2012, 09:16 PM
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Broken cam gear replacement

The static time is right on, but I disconnected the vacuum line on the distributor and the timing goes all over the place. I do not suspect the distributor which is brand new.
The timing system has a fiber plastic gear which is very undependable and has a history of documented failures. The replacement cam gear is aluminum, and is 100% reliable.
I have done all the other tests, compression on all cylinders is within good limits and has not changed since I got the engine. This would rule out head gasket and rings. Since the problem seems to be affecting all 6 cylinders that rules out bent valves on shear logistics.
I have the vibration dampener pulley off so I will know tomorrow morning.

Carl

Last edited by 27TRoadsterguy; 05-24-2012 at 09:26 PM.
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Old 05-25-2012, 08:04 AM
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Broken cam gear replacement

Here are the new gears, notice the instruction sheet, says the camshaft and crankshaft must be OUTSIDE the engine for installation. I don't understand this requirement. Looking for someone who has already done this work previously.
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Last edited by 27TRoadsterguy; 05-25-2012 at 08:27 AM.
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