View Full Version : Damn SR jumped timing
180InProgress
06-01-2006, 12:05 AM
I'm hoping I can get some help here. Awhile ago my Sr jumped timing when I was driving the Las Vegas strip. I knew it was timing right away, I had been driving it around for over 2 months without any problems even after a few races. However when I got into Las Vegas, where I currently reside now, I experienced a misfire which in less than a few hours turned into a stalling and smoking problem. I pulled my 240 back into my garage and all I could smell was fuel. I cleaned my MAF, checked all wiring, got new spark plugs, and checked vacuum lines... after this I attempted to adjust timing but the engine wouldn't hold and kept stalling. No matter how hard I tried it would not reset. So, now that I have procrastinated enough I feel that I have to fix my 240 now... after 3 months of it sitting in the garage and my girlfriends getting pissed I'm always using her car.
So, I decided to adjust the timing the hard way and take the valve cover off. Upon removal of the Rocker/valve cover I discovered my exhaust cam was off and my intake cam looks off too, but I can't tell. I know the cam mating mark is supposed to be 12 O'clock for the LH(exhaust) and 10 O'clock for the RH(intake) according to the manual. However can anyone tell me, judging by the pic, how off my timing is and would this cause the timing problem I have? Also, is the cam on the left in the pic lined up right or no?
Thanks in advance
http://img207.imageshack.us/my.php?image=srchain7ln.jpg
k2fender
06-01-2006, 12:34 AM
The timing is off. There should be 8 links from the top of the timing chain guide to the mating marks on the camshaft sprokets on each side. There should also be 9 links from the mating mark on the intake camshaft to the link before the mating mark on the exhaust camshaft(or just 10 links including the one on both of the mating marks on both of the sprokets). Hopefully that makes sense. The intake should also be at 10 o clock and the exhaust at 12 and the crankshaft should be set at one on the tdc.
180InProgress
06-01-2006, 03:04 AM
The timing is off. There should be 8 links from the top of the timing chain guide to the mating marks on the camshaft sprokets on each side. There should also be 9 links from the mating mark on the intake camshaft to the link before the mating mark on the exhaust camshaft(or just 10 links including the one on both of the mating marks on both of the sprokets). Hopefully that makes sense. The intake should also be at 10 o clock and the exhaust at 12 and the crankshaft should be set at one on the tdc.
I know the degree settings, but does the intake side look right? It just doesn't seem close enough to me and I really don't want to take the front of the engine apart right now to reset that sprocket if it is off.
k2fender
06-01-2006, 09:38 AM
I know the degree settings, but does the intake side look right? It just doesn't seem close enough to me and I really don't want to take the front of the engine apart right now to reset that sprocket if it is off.
Read what I said then look at your timing. It is off. You have 10 links instead of 9 from camshaft mating mark to camshaft mating mark. Take off the sprokets and reset it. It's simple.
drifter808
06-01-2006, 09:44 AM
alos look at the cam lobes. at TDC the first cylinder the lobes should be pointing away from eachother and not putting pressure on the rocker at all. i still have a hard time figureing out how your timing skipped cause chains aren't really supposed to do that. is your tensioner in good working condition?
180InProgress
06-01-2006, 04:13 PM
Read what I said then look at your timing. It is off. You have 10 links instead of 9 from camshaft mating mark to camshaft mating mark. Take off the sprokets and reset it. It's simple.
I read what you K2, but my concern is I'd have to take the oil pump and work on the whole timing chain to increase slack on the upper side wouldn't I? Or is it possible to just loosen the cam sprocket and adjust without messing with the lower part of the chain?
180InProgress
06-01-2006, 04:17 PM
alos look at the cam lobes. at TDC the first cylinder the lobes should be pointing away from eachother and not putting pressure on the rocker at all. i still have a hard time figureing out how your timing skipped cause chains aren't really supposed to do that. is your tensioner in good working condition?
Yeah, I don't get how it jumped too. The internals look great, the chain looks perfect and there is no damage to the cam sprockets. I have heard that the SR's have a problem with this if you're not careful.
My SR went to crap after I romped on the gas to catch up to a cabbie on the strip to flip him the bird for cutting me off.... these f***ers out here drive like no one else is on the road.
your timing didn't jump. you need to turn the crank until the timing marks line up. by the picture, you need to turn it about 4 more full rotation for it to line up correctly. then line up the crank to TDC. now dial your CAS to 0 degree and pop it in.
180InProgress
06-01-2006, 06:30 PM
your timing didn't jump. you need to turn the crank until the timing marks line up. by the picture, you need to turn it about 4 more full rotation for it to line up correctly. then line up the crank to TDC. now dial your CAS to 0 degree and pop it in.
Crap, I realized what your saying NRG, It took a couple of glances at the FSM to realize. I'm gonna try this tight now, thanks everyone for your input.
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