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Old 02-03-2010, 02:22 PM   #1
nosajnil
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Default quick ignition timing question

i saw a "mechanic's special" deal, he said the car needs timing belt, it slips off one time
and he try to put it back on, and engine starts to jump and then die off, and the belt slips off again

does wrong ignition timing makes engine jump like that?
i am wondering if he didn't do it right, or there's other problem with the car(blown head gasket also makes engine jump?)

what makes belt slips off?


also, to take the timing belt cover off a 1979 240, there's 2 bolts on top, and 1 near the bottom, and what else?

Last edited by nosajnil; 02-03-2010 at 04:10 PM..
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Old 02-03-2010, 02:29 PM   #2
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Odds are the tensioner has not been installed or set properly, or more likely, the mechanic is incompetent.
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Old 02-03-2010, 02:47 PM   #3
nosajnil
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it was no mechanic! he and his dad try to fix it(with old belt)....b/c they don't want to put money into the car
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Old 02-04-2010, 05:54 AM   #4
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On a 79 there is guides for the timing belt on the cam sprocket as well as guide washers on the crankshaft pulley. So more than likely they have bent the tensioner as suggested or they left off the upper guides which would put the upper sprocket too close to the engine. There are two lower bolts on the early cover. A 10mm hex bolt a bit under the water pump and a 12mm hex bolt at the bottom right side of the cover.
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Old 02-04-2010, 09:04 AM   #5
nosajnil
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does wrong ignition timing makes engine jump ? or erradic idle?
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Old 02-04-2010, 09:25 AM   #6
dl242gt
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Yes, it can make an engine backfire. I'd also check the firing order. Maybe that is incorrect.
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Old 02-04-2010, 09:31 AM   #7
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when my timing was effed the belt would jump right off, i could sit there and watch it wander off. the good thing about these engines though is that they are non-interference. so itll be fine, just get a new belt and tensioner and take your time.
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