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Ring replacement

"G"

By "G",
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"G" Contributor

"G"

Posted
Posted

This is my first r32 gt-r. I bought it with what seems to be a dead cylinder #6. Will be doing a compression test soon. My question is this, can you access the #6 piston from the bottom if I remove oil pan? I know I'd also have to remove the head to remove the piston from the top. I was thinking of flex honing the cylinder and installing new rings. 

img-0881-300x300-1.jpg

flexhone-before-after.jpg

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KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

If there was a simple solution surely the seller would already have done it. Have you even jacked up the car to consider what it would take to remove the sump/diff!? Do the compression test. If you have access stick a camera down the plug hole.

Duncan Grand Master

Duncan

Posted
Posted
17 hours ago, "G" said:

This is my first r32 gt-r. I bought it with what seems to be a dead cylinder #6. Will be doing a compression test soon. My question is this, can you access the #6 piston from the bottom if I remove oil pan? I know I'd also have to remove the head to remove the piston from the top. I was thinking of flex honing the cylinder and installing new rings. 

img-0881-300x300-1.jpg

flexhone-before-after.jpg

Hope the price took into account the problem mate.

If you want to replace the rings you need to at least hone the cylinder.

To hone the cylinder you need the piston and rod out.

To take the piston and rod out you need the head off, or may be the crank out

To take the crank out you need to undo the rear main oil seal and oil pump bolts, and remove the sump

To remove the rear main oil seal you need to remove the gearbox. And clutch. And flywheel.

To remove the oil pump you need to remove the timing belt gear. And timing belt. And timing belt cover. And the radiator.

To remove the sump....well....don't know. Probably front subframe out which means brakes off, steering shaft disconnected, ABS unplugged, top shock bolts and upper control arm bolt, power steering lines off, exhaust dump pipe off.

We could do this list all day. Basically you have a repair that is going to cost a minimum 5 grand to do at a shop if they do minimal work. If at all possible you should spend about twice and rebuild the whole motor including new seals and gaskets, rings, bearings, machining, oil and water pump, head reco. You should consider boring out the block and putting in forged pistons at the same time. 

You have one of the best performance cars ever made, it would be a shame to have an engine that is not right.

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GTSBoy Grand Master

GTSBoy

Posted
Posted

Well, actually, you can get a rod&piston out with the crank still in.  But getting the sump off a GTR in car is not a pleasant exercise.  Pleasantness issues aside, the pure silliness of attempting to hone just one cylinder in an RB26 in situ rather than doing the job properly still needs to be stressed.  Either do it properly or sell it on to someone who will.

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