Over heating problem! From head swap?? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

blown331 · 02-04-2006, 11:13 AM

I did a search and couldn't find anything about this, so here goes....

Did a head swap on my '95 240sx. I replaced it with a freshly rebuilt one. However, when I was bolting it back on the valve cover didn't fit. Therefore I got a head with a different casting number! So, I went and found a '91-'93 valve/timing chain cover and it seems to have bolted up fine! Now, my car overheats! I have a new t-stat, waterpump, timing chain. I am thinking that it could be the head gasket (although the fitment seemed good). What do you all think or is there something else I need to do.

BTW, the casting number on my stock head 70f and the new head is 53f.

Thanks for the input!

nrg · 02-04-2006, 11:30 AM

You warp the head because you torque it down wrong. have fun.

blown331 · 02-04-2006, 11:53 AM

What exactly does that mean? A warped head is causing the overheating? Trust me, I am having fun!

DrtyRat · 02-04-2006, 12:07 PM

yeah if the head is warped then it won't seal properly w/the hg...take the head to a machine shop and get it resurfaced if thats the prob

blown331 · 02-04-2006, 12:12 PM

trying to figure out why would it be warped, its a fresh reman. head.

bb4_96 · 02-04-2006, 07:48 PM

meesing around with different heads will get you in trouble. Think about all the engines nissan has made. you can botch the head by improper torquing so lay a rule atop the head on the mating surface and check with a feeler gauge to see if it's straight. otherwise...

NIK90s13 · 02-04-2006, 08:39 PM

''bb4 96'' is right. Different heads have different cooling ports that may not line up with your block, restricting coolent flow. If you have the head off, check the cooling ''holes'' to the head gasket, and match them to the block. You probably are missed matched. BUT, Easy first!!!!! Rebleed the cooling system!!!!! We've all been through that hoop!

02-04-2006, 11:13 AM	#1
blown331 Join Date: Feb 2006 Location: North Carolina Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	Over heating problem! From head swap?? I did a search and couldn't find anything about this, so here goes.... Did a head swap on my '95 240sx. I replaced it with a freshly rebuilt one. However, when I was bolting it back on the valve cover didn't fit. Therefore I got a head with a different casting number! So, I went and found a '91-'93 valve/timing chain cover and it seems to have bolted up fine! Now, my car overheats! I have a new t-stat, waterpump, timing chain. I am thinking that it could be the head gasket (although the fitment seemed good). What do you all think or is there something else I need to do. BTW, the casting number on my stock head 70f and the new head is 53f. Thanks for the input!

02-04-2006, 11:30 AM	#2
nrg Zilvia FREAK! Join Date: Mar 2004 Location: CA Age: 40 Posts: 1,571 Trader Rating: (1) Feedback Score: 1 reviews	You warp the head because you torque it down wrong. have fun. __________________ driftingisgay.com

02-04-2006, 08:39 PM	#7
NIK90s13 Zilvia Junkie Join Date: Jan 2006 Location: texas Age: 58 Posts: 471 Trader Rating: (0) Feedback Score: 0 reviews	''bb4 96'' is right. Different heads have different cooling ports that may not line up with your block, restricting coolent flow. If you have the head off, check the cooling ''holes'' to the head gasket, and match them to the block. You probably are missed matched. BUT, Easy first!!!!! Rebleed the cooling system!!!!! We've all been through that hoop! Last edited by NIK90s13; 02-04-2006 at 09:24 PM..

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02-04-2006, 11:53 AM	#3
blown331 Join Date: Feb 2006 Location: North Carolina Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	What exactly does that mean? A warped head is causing the overheating? Trust me, I am having fun!

02-04-2006, 12:07 PM	#4
DrtyRat Nissanaholic! Join Date: Jan 2005 Location: Miami,Fl Posts: 1,747 Trader Rating: (9) Feedback Score: 9 reviews	yeah if the head is warped then it won't seal properly w/the hg...take the head to a machine shop and get it resurfaced if thats the prob

02-04-2006, 12:12 PM	#5
blown331 Join Date: Feb 2006 Location: North Carolina Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	trying to figure out why would it be warped, its a fresh reman. head.

02-04-2006, 07:48 PM	#6
bb4_96 Zilvia Addict Join Date: Jan 2006 Location: Under my car Posts: 785 Trader Rating: (4) Feedback Score: 4 reviews	meesing around with different heads will get you in trouble. Think about all the engines nissan has made. you can botch the head by improper torquing so lay a rule atop the head on the mating surface and check with a feeler gauge to see if it's straight. otherwise...