Engine / Transmission Teardown Photos - ZX6R Forum
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post #1 of 9 Old 08-23-2019, 11:58 AM Thread Starter
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Engine / Transmission Teardown Photos

https://imgur.com/a/unaHU3U

About 12-13k miles, 1.5 race seasons and a couple dozen trackdays probably. Engine is in overall decent condition but pistons, rings, and main and rod bearings are all worn out past spec. Valves ok. The transmission is pretty much toast, you can see damage on those gear parts. The clutch hub has damage from the springs, which possibly damaged the oil pump rotor which needed to be replaced. Luckily that didnít fail which would have caused total destruction.

Luckily I was able to find a used transmission and clutch assembly for under $300.
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post #2 of 9 Old 08-23-2019, 12:49 PM
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Where'd you get the transmission? I'm looking for one as well.

JL99
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post #3 of 9 Old 08-23-2019, 03:20 PM Thread Starter
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Originally Posted by jd41 View Post
Where'd you get the transmission? I'm looking for one as well.
eBay. Needed something fast. I went for one that had high quality close up photos.

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post #4 of 9 Old 08-23-2019, 03:29 PM
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Just looking at the pics

I would bet oil pressure was down by atleast 5psi with how polished/worn the rod and main bearings are

did you measure the cylinder bores? how true are those

How about those pistons, what was worn out on those (they tend to not wear and last til something else fails and busts them)

That transmission could be undercut and micro polished and be better than new with some new shims and clips.......of course that comes at a cost too, more than any used trans on ebay...(but much better too)
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Stupid people say stupid things on the internet, so be wary of who those people are. If you solicit advice on the internet, just keep in mind 99% of what you'll receive is not based on fact or science-and likely atleast 95% of it is based on bullshit and bravado regurgitated from some other schlub who also did not experience any of what they claim and are also full of shit. If you don't like my bluntness- too bad. I am not here to please you, so move along, your approval is not desired nor is it needed. So before opening your pie hole and adding more stupidity, perhaps sit back, listen, absorb and learn something. You know that saying, it is better to remain silent and thought a fool than to open your mouth and remove all doubt!
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post #5 of 9 Old 08-23-2019, 03:44 PM Thread Starter
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Quote:
Originally Posted by riverszzr View Post
Just looking at the pics

I would bet oil pressure was down by atleast 5psi with how polished/worn the rod and main bearings are

did you measure the cylinder bores? how true are those

How about those pistons, what was worn out on those (they tend to not wear and last til something else fails and busts them)

That transmission could be undercut and micro polished and be better than new with some new shims and clips.......of course that comes at a cost too, more than any used trans on ebay...(but much better too)
Michael Castro at GP Suspension did all the measuring and repairs.

Good to know about the transmission. Who would fix it like that and at what cost?

I havenít seen the pistons myself yet. I know we are replacing the pistons and rings but not doing any cylinder work. Why would the oil pressure be down? And no warning light from the dash or error code?

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post #6 of 9 Old 08-23-2019, 04:01 PM
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The bigger the clearance between the rod bearings and main bearings the lower the oil pressure is going be (leakage around them)

I use oil pressure drop as a guide to rebuild intervals on every engine I build... and I have seen as much as 10psi drop without them blowing up but those usually you can start to see the copper color in the bearing inserts......... (so not even 100 miles left in them before they implode)

You won't get any oil pressure warning light unless you have zero oil pressure....... stock is generally about 40-42 psi oil pressure on most jap inline fours

Transmission........ there are atleast 5 or 6 reputable centers who will and can undercut transmissions and give them ISF treatment....expect to pay about $500-$700 total

generally ISF is about $250.lots of places to do this, some way better than others

orient express is around $500
APE in CA is about $400
M/T in TN is about $400
Vance & Hines race center in Indiana is about ?
Fast by Gas does it- also no idea what cost
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Stupid people say stupid things on the internet, so be wary of who those people are. If you solicit advice on the internet, just keep in mind 99% of what you'll receive is not based on fact or science-and likely atleast 95% of it is based on bullshit and bravado regurgitated from some other schlub who also did not experience any of what they claim and are also full of shit. If you don't like my bluntness- too bad. I am not here to please you, so move along, your approval is not desired nor is it needed. So before opening your pie hole and adding more stupidity, perhaps sit back, listen, absorb and learn something. You know that saying, it is better to remain silent and thought a fool than to open your mouth and remove all doubt!
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post #7 of 9 Old 08-23-2019, 04:36 PM Thread Starter
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These are all the parts I needed if anyone is curious. Not listed is an ignition coil I cracked on accident, clutch pressure plate and inner hub, and transmission
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post #8 of 9 Old 08-23-2019, 04:37 PM Thread Starter
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Quote:
Originally Posted by riverszzr View Post
The bigger the clearance between the rod bearings and main bearings the lower the oil pressure is going be (leakage around them)

I use oil pressure drop as a guide to rebuild intervals on every engine I build... and I have seen as much as 10psi drop without them blowing up but those usually you can start to see the copper color in the bearing inserts......... (so not even 100 miles left in them before they implode)

You won't get any oil pressure warning light unless you have zero oil pressure....... stock is generally about 40-42 psi oil pressure on most jap inline fours

Transmission........ there are atleast 5 or 6 reputable centers who will and can undercut transmissions and give them ISF treatment....expect to pay about $500-$700 total

generally ISF is about $250.lots of places to do this, some way better than others

orient express is around $500
APE in CA is about $400
M/T in TN is about $400
Vance & Hines race center in Indiana is about ?
Fast by Gas does it- also no idea what cost
Thanks Rivers. Hope it runs like a monster now. Thin head gasket and re degreed the camshaft

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post #9 of 9 Old 09-01-2019, 03:05 PM
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What causes the clutch center to get worn like that?

Also, were you having any transmission issues with all those worn dogs?


JL99
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