Surprise after shopping for parts - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Annon · 27th April 2011, 08:45 AM

So heres a scenario,

Got a whole bunch of parts e.g. je pistons, eagle rods, bearings blah blah blah for a rebuild of an engine. I pulled apart the block and sent it in to get machined and for them to assemble the short block as i have no precision tools to do myself.

As i was pulling the block apart i saw that everything had genuine nissan markings so i was pretty glad to see that the motor was still stock even though the car was purchased from a dealership and afew mods done to the car.

After i take it into the shop i get a call a week later saying that the crank is f**k'd and that the thrust surface on the crank is rooted :S (too many harsh gear changes?) thats ok i didnt mind that but then they told me that the cylinder walls have been bored out already and the clearance for the je pistons (86.49mm) is too much.

I need some advice on what to do from here?.....i need a new crank thats all good nothing much i can do here but what do i do about this piston situation.

Any input would be much appreciated.

Annon · 27th April 2011, 09:06 AM

kk.....just an update

i just had a look at the service manual of the R32 RB26DETT and it says that the highest grade (3) of an OE piston is 85.985mm in diameter and the bore should be 86.030.

hmmmmmm.....

Did i just try and get dicked by this company?

R32 Combat · 27th April 2011, 01:56 PM

IIRC, you can get .5 oversize nissan pistons.

R.I.P.S NZ · 2nd May 2011, 02:16 AM

Sounds like the motor has had an incorrectly adjusted clutch at some stage and your block has already been bored to 86.5mm.

Forged pistons usually need slightly more clearance than stock postons so it is a little strange that your bore is already too big for the new forgies (unless it has alot of wear since the last bore). What clearance do they say you'd have with the new JE's if they gave the bore a quick hone?

Annon · 2nd May 2011, 09:37 AM

he couldn't exactly give me the measurement of the bore cause the worker thats working on my engine was away at the time of my call so i just bit the bullet and got some ross 1mm oversized. i need this car up and running in 2 weeks so everything is happening 320km/h :P hehe

oh and just a little side question.....you wouldnt happen to have an exhaust manifold that i can purchase off you for a t51r kai?

gtr-loz · 2nd May 2011, 09:49 AM

as rob says forged pistons need different (usually bigger) clearances especially je which i believe expand quite a bit on heat up as they have low silicon content compared with hks there should have been a leaflet in with the pistons which states the clearance needed im not sure why he couldnt read that!

Annon · 2nd May 2011, 10:01 AM

yeah i know what you mean and the leaflet in the je box stated that it should be at a clearance of 0.10mm min and more if need be but i didnt wanna go into details of who knows what with the guy so i just saved argument and got the 1.0mm oversized.

R.I.P.S NZ · 2nd May 2011, 08:12 PM

Quote:

Originally Posted by Annon

oh and just a little side question.....you wouldnt happen to have an exhaust manifold that i can purchase off you for a t51r kai?

Nothing sorry, I had someone ring me last week about it.

Annon · 3rd May 2011, 02:18 AM

Yeah that was probably me lol. U would happen to have a spare crank i can buy off you as well?

R.I.P.S NZ · 3rd May 2011, 02:39 AM

26 or 30?

Annon · 3rd May 2011, 03:39 AM

26 mate

R.I.P.S NZ · 3rd May 2011, 04:34 AM

nothing sorry

27th April 2011, 08:45 AM	#1 (permalink)
Annon Annon is back to a build started years ago :S GTR Register Member Join Date: Nov 2007 Location: Auckland, New Zealand Cars owned: Nissan Laurel Posts: 26	Surprise after shopping for parts So heres a scenario, Got a whole bunch of parts e.g. je pistons, eagle rods, bearings blah blah blah for a rebuild of an engine. I pulled apart the block and sent it in to get machined and for them to assemble the short block as i have no precision tools to do myself. As i was pulling the block apart i saw that everything had genuine nissan markings so i was pretty glad to see that the motor was still stock even though the car was purchased from a dealership and afew mods done to the car. After i take it into the shop i get a call a week later saying that the crank is f**k'd and that the thrust surface on the crank is rooted :S (too many harsh gear changes?) thats ok i didnt mind that but then they told me that the cylinder walls have been bored out already and the clearance for the je pistons (86.49mm) is too much. I need some advice on what to do from here?.....i need a new crank thats all good nothing much i can do here but what do i do about this piston situation. Any input would be much appreciated. __________________

27th April 2011, 09:06 AM	#2 (permalink)
Annon Annon is back to a build started years ago :S GTR Register Member Join Date: Nov 2007 Location: Auckland, New Zealand Cars owned: Nissan Laurel Posts: 26	kk.....just an update i just had a look at the service manual of the R32 RB26DETT and it says that the highest grade (3) of an OE piston is 85.985mm in diameter and the bore should be 86.030. hmmmmmm..... Did i just try and get dicked by this company? __________________

27th April 2011, 01:56 PM	#3 (permalink)
R32 Combat R32 Combat is in limbo Spannering again. Join Date: Jan 2004 Location: Berkshire Cars owned: R33 GTR Posts: 7,585	IIRC, you can get .5 oversize nissan pistons. __________________ SKYLAB FUSION. The 3rd generation torque split controller for the ultimate driving experience. This replaces your old G-Sensor for a digital, faster responding, unit along with offering the driver the ability to alter the balance of the cars 4WD power delivery for the optimum balance. A free fitting service is available at Skylab HQ, which is postcode RG19 Only £229. plus £10 p&p worldwide tracked postage Also available in the GTROC online shop To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2nd May 2011, 02:16 AM	#4 (permalink)
R.I.P.S NZ R.I.P.S NZ is happy with a mild mannered 8.51 @ 163 in MGAWOT II GTR Register User Join Date: May 2004 Location: Rotorua NZ Cars owned: R32 GTS4 Posts: 6,473	Sounds like the motor has had an incorrectly adjusted clutch at some stage and your block has already been bored to 86.5mm. Forged pistons usually need slightly more clearance than stock postons so it is a little strange that your bore is already too big for the new forgies (unless it has alot of wear since the last bore). What clearance do they say you'd have with the new JE's if they gave the bore a quick hone? __________________

2nd May 2011, 09:37 AM	#5 (permalink)
Annon Annon is back to a build started years ago :S GTR Register Member Join Date: Nov 2007 Location: Auckland, New Zealand Cars owned: Nissan Laurel Posts: 26	he couldn't exactly give me the measurement of the bore cause the worker thats working on my engine was away at the time of my call so i just bit the bullet and got some ross 1mm oversized. i need this car up and running in 2 weeks so everything is happening 320km/h :P hehe oh and just a little side question.....you wouldnt happen to have an exhaust manifold that i can purchase off you for a t51r kai? __________________

2nd May 2011, 09:49 AM	#6 (permalink)
gtr-loz gtr-loz is cold GTR Register User Join Date: Feb 2006 Location: Benfleet, Essex Posts: 1,120	as rob says forged pistons need different (usually bigger) clearances especially je which i believe expand quite a bit on heat up as they have low silicon content compared with hks there should have been a leaflet in with the pistons which states the clearance needed im not sure why he couldnt read that! __________________

2nd May 2011, 10:01 AM	#7 (permalink)
Annon Annon is back to a build started years ago :S GTR Register Member Join Date: Nov 2007 Location: Auckland, New Zealand Cars owned: Nissan Laurel Posts: 26	yeah i know what you mean and the leaflet in the je box stated that it should be at a clearance of 0.10mm min and more if need be but i didnt wanna go into details of who knows what with the guy so i just saved argument and got the 1.0mm oversized. __________________

3rd May 2011, 02:18 AM	#9 (permalink)
Annon Annon is back to a build started years ago :S GTR Register Member Join Date: Nov 2007 Location: Auckland, New Zealand Cars owned: Nissan Laurel Posts: 26	Yeah that was probably me lol. U would happen to have a spare crank i can buy off you as well? __________________

3rd May 2011, 02:39 AM	#10 (permalink)
R.I.P.S NZ R.I.P.S NZ is happy with a mild mannered 8.51 @ 163 in MGAWOT II GTR Register User Join Date: May 2004 Location: Rotorua NZ Cars owned: R32 GTS4 Posts: 6,473	26 or 30? __________________

3rd May 2011, 03:39 AM	#11 (permalink)
Annon Annon is back to a build started years ago :S GTR Register Member Join Date: Nov 2007 Location: Auckland, New Zealand Cars owned: Nissan Laurel Posts: 26	26 mate __________________

3rd May 2011, 04:34 AM	#12 (permalink)
R.I.P.S NZ R.I.P.S NZ is happy with a mild mannered 8.51 @ 163 in MGAWOT II GTR Register User Join Date: May 2004 Location: Rotorua NZ Cars owned: R32 GTS4 Posts: 6,473	nothing sorry __________________

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