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Author Topic: Head Bolt Issue"s Torque Specs???  (Read 1249 times)

r32_purpose

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Head Bolt Issue"s Torque Specs???
« on: September 04, 2011, 05:18:16 PM »
My Most recent purchase is a r32 4 door rb20det. i got it with a blown head gasket. i've got the head off after some hassle! ( 3 head bolts had been stripped so we had to MIG My socket to it ) i've just had the head skimmed and have the new gasket. i just need head bolts and torque specs then i should be away!- though.... after looking at the top of piston number 5 there are small dents nothing to big but defenatly not supposed to be there. How badly will this affect it??? also do i need to torque the cams in speciffically?? if yes can anyone point me in the right direction? also would it be recommended to get a new intake gasket and exhuast gasket or can i just use some putty stuff?

Cheers Ollie

Shrike

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Head Bolt Issue"s Torque Specs???
« Reply #1 on: September 04, 2011, 05:32:50 PM »
the head gasket should have a peice of paper with all the torque specs listed with it.

And may as well change the intake and exhaust gaskets at the same time.

post pics if you can and as long as the bores/rings are ok shouldnt be an issue it may be from detonation or metallic damage ie something has gone threw ie parts of a spark plug
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r32_purpose

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Head Bolt Issue"s Torque Specs???
« Reply #2 on: September 04, 2011, 05:40:17 PM »
Thanks! I Shoulda Looked there! Yup Its says. =D. Do I Need To Torque the cams down specifically? i had to take them out to get the mig in.
Will try post pics but bores are fine. dont think rings are damaged. any way of telling??

Thanks Heaps O.K

Shrike

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Head Bolt Issue"s Torque Specs???
« Reply #3 on: September 04, 2011, 05:49:03 PM »
Quote from: MZ ROLA;555218
Personally i prefer DP

Quote from: Stalk3r;558679
mmmm sausage

R32ONP

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Head Bolt Issue"s Torque Specs???
« Reply #4 on: September 04, 2011, 05:55:27 PM »
i would replace the piston .. u wouldnt want to build it all up nice new headgasket and bolts and a skimmed head to have the piston fail
Steer from the rear ..... Drop it like its hot !!!

Stalk3r

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Head Bolt Issue"s Torque Specs???
« Reply #5 on: September 04, 2011, 06:10:31 PM »
also that sheet unless im blind doesnt say cam cap torque, which is specific, that also doesnt tell you the order in which to remove - install, which is important

edit: i lie it looks like it does say the cam torque, doesnt tell you the order though

R32ONP

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Head Bolt Issue"s Torque Specs???
« Reply #6 on: September 04, 2011, 06:14:24 PM »
start from the center and work way out to the ends..standard procedure for anything be it cam caps or main caps or head gaskets
Steer from the rear ..... Drop it like its hot !!!

r32_purpose

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Head Bolt Issue"s Torque Specs???
« Reply #7 on: September 04, 2011, 06:25:06 PM »
DRFERO's.....You Are The Man! Thanks Heaps Thats Exactly what i need!
and as for the piston i think i'll have to risk it. i just dont have enough experience and cash to do it right now, -Likely out come........Next Weeks Thread-HOW TO REMOVE RB20DET PISTONS. LOL.
and thanks SHRIKES Its Perfect Just What i need. little small though. i printed it but the magnifine glass is doing the trick =D. Thanks
« Last Edit: September 04, 2011, 06:30:46 PM by r32_purpose »

Shrike

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Head Bolt Issue"s Torque Specs???
« Reply #8 on: September 04, 2011, 06:35:18 PM »
sorry best I could do lol if you want me to email you a copy let me know
Quote from: MZ ROLA;555218
Personally i prefer DP

Quote from: Stalk3r;558679
mmmm sausage

R32ONP

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Head Bolt Issue"s Torque Specs???
« Reply #9 on: September 04, 2011, 06:59:40 PM »
pistons are very easy to remove once head is off

simply put the cylinder on Bottom dead center (makes easier to get onto the heads) and loosen the big end caps..push the piston out through the top...comes out with rod attached

for reinstalling you need a piston ring compressor
Steer from the rear ..... Drop it like its hot !!!

r32_purpose

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Head Bolt Issue"s Torque Specs???
« Reply #10 on: September 04, 2011, 08:03:01 PM »
Oh. Its Just The Motor Is Still In The Car.
cheers o.k

GETLOW

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Head Bolt Issue"s Torque Specs???
« Reply #11 on: September 06, 2011, 09:23:42 PM »
Don't over torque the cam caps.. If you do the motor may sieze.. I have seen that before on engines customers have built themselves..

I know I usually do them progessivly to keep the cam straight and to stop it pinching the surfaces. Its worth putting some assembly lube on them too since you have had it all apart.
1JZ VVTI R33 using a custom RB25DET gearbox (almost running)

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r32_purpose

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Head Bolt Issue"s Torque Specs???
« Reply #12 on: September 07, 2011, 01:59:35 PM »
Thanks Mate Putting Them In As Right Now (Lunch Break!) :).
Yes I'm Using Oil under caps and everywhere. Pretty much drowning it. Hah,

Cheers Ollie

GETLOW

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Head Bolt Issue"s Torque Specs???
« Reply #13 on: September 08, 2011, 10:06:22 PM »
oh yeah and make sure that you put them in the right position and on the right side. as each cap has to be in order and on the right side..

But that info is a bit late for you now..
1JZ VVTI R33 using a custom RB25DET gearbox (almost running)

Shred Motorsport
67 Pharazyn Street
Lower Hutt, Wellington
http://www.SHREDMOTORSPORT.co.nz
(04) 569 7469