Rasp933 Posted January 9, 2013 Report Share Posted January 9, 2013 Hello, ratsun. I have close to 3000 miles on a rebuilt l20b.now the question is wen do i retorque the head bolts?or should i just leave them alone?if i do retorque,do i need to back off a bit then torque? Quote Link to comment
datzenmike Posted January 9, 2013 Report Share Posted January 9, 2013 L motors usually don't need this done to them. But no harm in checking them every tune up. Loosen one at a time and torque directly to 60 ft lbs (on an L20B) maybe 55 on L16... I forget. Do in any order you like as long as you only loosen one at a time. The FSM recommends this at every tune up on the Z24 motor. Very important as this motor is subject to blowing the head gasket.. Quote Link to comment
Stoffregen Motorsports Posted January 9, 2013 Report Share Posted January 9, 2013 L motors usually don't need this done to them. But no harm in checking them every tune up. Loosen one at a time and torque directly to 60 ft lbs (on an L20B) maybe 55 on L16... I forget. Do in any order you like as long as you only loosen one at a time. The FSM recommends this at every tune up on the Z24 motor. Very important as this motor is subject to blowing the head gasket.. I disagree. Stock gaskets require it less than aftermarket, but retorque should always be done. 500 miles is usually enough. Yes, loosen the bolts at least a 1/8 to 1/4 turn before torquing them. And be sure to take the radiator cap off (or at least loosen it) or you run the risk of leaking coolant into the motor. 1 Quote Link to comment
Rasp933 Posted January 9, 2013 Author Report Share Posted January 9, 2013 Appreciate it guys Quote Link to comment
Rasp933 Posted January 9, 2013 Author Report Share Posted January 9, 2013 Can this b done when the engine is cold or it needs to b a operating temp? Quote Link to comment
ggzilla Posted January 9, 2013 Report Share Posted January 9, 2013 It must be done with the engine cold. The FSM used to talk about "Retightening cylinder head bolts" for L-series, ever 12,000 miles or twelve months. But later FSM did not mention it. I thing it's a good idea to do it every few years. It's cheap insurance. Doing a retorque after the first 600 miles is for old-school gaskets. Modern ones are "non-retorque". Quote Link to comment
Rasp933 Posted January 10, 2013 Author Report Share Posted January 10, 2013 Ok the engine was rebuilt by local shop here in town. Wen I called them. They said that it doesn't. Need to b retorqued.so iam confused here a bit. Quote Link to comment
Dat510_Chris Posted January 10, 2013 Report Share Posted January 10, 2013 Newer head gaskets tell you not to re-torque. Quote Link to comment
banzai510(hainz) Posted January 10, 2013 Report Share Posted January 10, 2013 I have never done this myself on my motors but on a motor somebody else did it would have saved me a headgasket change. dosent hurt to put 40 pounds on there just to ck. You need that 10mm head allen from Sears anyway with a good torq wrench Quote Link to comment
Z-train Posted January 10, 2013 Report Share Posted January 10, 2013 Newer head gaskets tell you not to re-torque. In correct.They tell you that it is "not needed".But if you retorque,you can't hurt anything. Quote Link to comment
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