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Car Forum / Oldsmobile Cars / July 200597 Aurora with Northstar engine..Head gasket problem!
hey all I have a 97 oldsmobile aurora and have been diagnoised with headgasket failure. I have a north star 4.0 caddy engine. It all started with it running hot when i am going 70 mph or more or when i am in stop and go traffic. I flushed the radiator and changed the thermostat with no avail... so i just took it in to have it checked. My brother is a mechanic so he can do all the labor.. I just need to make sure we don’t miss anything. I am told we ned some timeserts..where can i get these and what are they for. The mechanic said he could not see why it happened. I read about bolts backing out. . is that possible? also does the entire engine need to be pulled out? what type headgasket do i need? and is there some type of how-to on the net for this? thanks also would block sealant help? This no routine job a on that engine, a factory manual with all the procedural updates, or a subscription to Alldata would be a bid assist. > hey all I have a 97 oldsmobile aurora and have been diagnoised with > headgasket failure. I have a north star 4.0 caddy engine. It all [quoted text clipped - 13 lines] > > also would block sealant help? Just talked with a Cadillac Dealer who has done the job on Northstar engines. The dealer will pull both heads and charge about 2000.00, However if you do it you just need a gasket kit, which should have the new Head Bolts in there. You may also need to rethread carefully the old bolt holes and put in Heli-Coil inserts to make sure the new bolts don't back out. You need a service manual to know the exact torque specs and order. If it leaks don't over torque. Redo it!! Also make sure when you take off and replace the secondary timing belt that you put iit in TOP DEAD CENTER NO. 1 Cylinder. Also I believe the tesioner is mechanical. No Problem you won't have to replace it. Good Luck!!! Just talked with a Cadillac Dealer who has done the job on Northstar engines. The dealer will pull both heads and charge about 2000.00, However if you do it you just need a gasket kit, which should have the new Head Bolts in there. You may also need to rethread carefully the old bolt holes and put in Heli-Coil inserts to make sure the new bolts don't back out. You need a service manual to know the exact torque specs and order. If it leaks don't over torque. Redo it!! Also make sure when you take off and replace the secondary timing belt that you put iit in TOP DEAD CENTER NO. 1 Cylinder. Also I believe the tesioner is mechanical. No Problem you won't have to replace it. Good Luck!!!
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