Hi all, I've recently bought a Blazer that then suddenly sprung a major oil leak. After a bit of digging around I've found that the (what I think is) the Cam chain Plastic cover is broken, it looks like its had a bit of a box job done on it, so basically I'm looking for a new (used) plastic cover and a seal that goes behind the bottom pulley wheel.

Where is the best/ cheapest place to buy parts from and where are Blazer breakers in the Uk, I'm struggling to locate anywhere that can help.

Thanks in advance, Jake

 

In the States, it's called a "timing cover". On your 2000 4.3L engine, it must be replaced with a new one, (not used) each time it is removed. This is what you'll need: Dorman Products - 635-502 It is approximately $25USD. You can check on Amazon and Ebay to make sure they ship to the UK.

After it's installed, you must have the crankshaft position sensor relearn performed with a scan tool capable of initiating it. This is not optional, it must be done. The engine will start and run without doing the relearn, but not properly.

 

Thank you very very much. It's people like you what make these forums worth while :-). I've ordered it from amazon anyway so I'm expecting it within a week. Sweet.

Ill look into the relearn. With it not being your usual car round here I think I'll struggle finding a mechanic that's capable of stuff like that but ill look into it, I just hope I don't have to travel 200 miles for it, thanks again

 

Most of the "professional quality" scan tools, (worldwide) can initiate the relearn. If you find a GM dealer, they could certainly do it. The procedure takes all of about 5 minutes.

 

Be advised that if your Blazer is a 4wd version, you are in for alot of work to replace the timing cover as the oil pan must also be dropped and gasket replaced.

On the 2wd versions...not all that bad; on the 4wd ones...the front axle is in the way of getting the oil pan off.

 

Yup, I agree ^^^^

 

Thanks.. i think, you've fried my brain a bit now, I cant understand how it needs all this due to a little bit of broken plastic

 

The timing cover can, and usually does, get distorted with engine heat, and it can crack when removing it. The crankshaft position sensor mounts to the timing cover. It is an extremely accurate sensor and correct calibration is vital for proper engine performance. It emits a magnetic field that is focused in a very small area. The slightest movement of the sensor can throw the calibration off. If the timing cover and or crankshaft position sensor are moved, removed, replaced, or disturbed in any way, the relearn must be performed. The relearn tells the PCM exactly where the magnetic field is focused in relation to the spikes on the tone ring when they pass through the field. The relearn data is burned into memory and remains there until the next relearn. If the relearn is not performed, the PCM uses the calibration data from the previous relearn, which is now incorrect. If you can patch the hole in the timing cover without disturbing the cover or the sensor, no relearn would be necessary.

 

Any tips on how to get the bottom pulley off? I bought a remover tool but it shredded the threads.. seems like its already had a repair job at some point and im a little worried that they've glued the bottom pulley on, cheers

 

This should pop it right off: http://www.summitracing.com/parts/sx...FbE-Mgod_wUA5Q Put some pressure on the ram bolt, (don't go crazy with it) then tap on the ram bolt with a hammer a couple of times. Repeat until it comes off, shouldn't take much.