zoom Posted May 14, 2012 Share Posted May 14, 2012 Guys, Just got my rebuilt engine back from my machanic mate. After put evrything together, I have noticed coolant leaking out between tomei head gasket and the bottom block, on the driver side. Spoken to the mechanic said that it could be the head gasket faulty. He told me that head studs were tighten to about 87Nm. Note that the block and head have all machined. Any idea why is it leaking even before any pressure? Thanks Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/ Share on other sites More sharing options...
Simon-S14 Posted May 14, 2012 Share Posted May 14, 2012 87nm isnt much. are they ARP studs or stock bolts? Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356355 Share on other sites More sharing options...
zoom Posted May 14, 2012 Author Share Posted May 14, 2012 Arp studs. Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356411 Share on other sites More sharing options...
Simon-S14 Posted May 14, 2012 Share Posted May 14, 2012 should be around 95-100nm Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356507 Share on other sites More sharing options...
Humbla Posted May 14, 2012 Share Posted May 14, 2012 When i had a metal h gasket put in mechanic put water in for the first 1000 ks,said it was to make sure of no leaks.Then he put coolent in,no leaks. Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356532 Share on other sites More sharing options...
DVS JEZ Posted May 14, 2012 Share Posted May 14, 2012 Make sure its Not leaking from the inlet manifold gasket. What gasket did u use on the inlet manifold Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356538 Share on other sites More sharing options...
zoom Posted May 15, 2012 Author Share Posted May 15, 2012 Simon – what is the size of the studs? On ARP website, they recommend 62ft-bls (84Nm) for 10mm and 80ft-bls (108Nm). Hopefully under tightening is the cause. J. It is only leaking on the driver side HG/block. Jez – Used Nissan gaskets kits and Tomei head gasket. ARP main and head studs/bolts. Pretty sure it is not coming out of the inlet manifold. I can see the coolant between the head gasket and the bottom block, along the block. Is there any chance of faulty head gasket, block not machine properly? Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356670 Share on other sites More sharing options...
boostn0199 Posted May 15, 2012 Share Posted May 15, 2012 Was it tightentend in stages? From the way you wrote about 87 i would intepret that as not much care taken. Could be any one of those in correct tightening procedure, poor machining , faulty gasket allthough i wouldnt put that as very likely espicialy with the tomei ones as they are not as sensitive to surface flatness levels as other metal ones. Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356695 Share on other sites More sharing options...
zoom Posted May 15, 2012 Author Share Posted May 15, 2012 Simon – what is the size of the studs? On ARP website, they recommend 62ft-bls (84Nm) for 10mm and 80ft-bls (108Nm). Hopefully under tightening is the cause. J. It is only leaking on the driver side HG/block. Used Nissan gaskets kits and Tomei head gasket. ARP main and head studs/bolts. Pretty sure it is not coming out of the inlet manifold. I can see the coolant between the head gasket and the bottom block, along the block. Is there any chance of faulty head gasket, block not machine properly? Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356767 Share on other sites More sharing options...
zoom Posted May 15, 2012 Author Share Posted May 15, 2012 sorry double posted. yes, it was tigthened in stages, followed the Nissan manual. i personally don't think it is the HG faulty as you've said, This leaves the machining and tightening. Can anyone confirm the torque for the ARP head stud, hopefully they are under tightening, that ways i can just tightening it up to the required spec. Note the leaks is very little, even after puting about 14psi in the system. Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356783 Share on other sites More sharing options...
black bnr32 Posted May 15, 2012 Share Posted May 15, 2012 ask him what the Ra of the head and block were. apparently you want under 20 Ra when using a metal head gasket. mls gaskets also need time to settle before their final tourque Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6356968 Share on other sites More sharing options...
zoom Posted May 15, 2012 Author Share Posted May 15, 2012 actually the torque was 85ft-bls not NM. I will ask him later about the Ra thing. thanks Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6357084 Share on other sites More sharing options...
boostn0199 Posted May 15, 2012 Share Posted May 15, 2012 The machining would really really average if a tomei head gasket is leaking on it as they tolerate pretty much same surface finish as the stock headgasket. Should always use a straight edge on head and block before putting on the gasket just to double check. Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6357246 Share on other sites More sharing options...
camandcandice Posted May 15, 2012 Share Posted May 15, 2012 If its for an rb26 the correct torque is 125ft lbs in three equal steps with ARP moly lube Link to comment https://www.sau.com.au/forums/topic/400132-leaking-coolant-from-new-tomei-head-gasket/#findComment-6357532 Share on other sites More sharing options...
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