slash128's Top Mount Build
#2301
n3rd
Thread Starter
#2302
n3rd
Thread Starter
I recently got a "rattle" like Brettus:
https://www.rx8club.com/series-i-maj...0/#post4792932
and an oil leak between the front iron and house so I pulled it out and tore it down. No wear from the E&J seals, all apex seal surfaces have a mirror finish. Looks like I do have some exhaust port wear from the solid corner seals. Haven't found the cause of the rattle yet but the oil chain had excessive slack so I am thinking that might have been it...
https://www.rx8club.com/series-i-maj...0/#post4792932
and an oil leak between the front iron and house so I pulled it out and tore it down. No wear from the E&J seals, all apex seal surfaces have a mirror finish. Looks like I do have some exhaust port wear from the solid corner seals. Haven't found the cause of the rattle yet but the oil chain had excessive slack so I am thinking that might have been it...
Last edited by slash128; 11-23-2018 at 08:00 PM.
#2304
n3rd
Thread Starter
No worries about pulling it out, I have been curious to see what it looked like on the inside after seeing what Brettus found in his awhile back. All part of the Rotary Life
#2306
n3rd
Thread Starter
Yeah, I didn't blow this motor for a change, lol. I ran it hard at 17psi for the last 2 years and never had a detonation event that I was aware of, roughly 20K miles. It didn't quite build boost as quick as the remans I ran prior but when it kicked in it was still mean. I have been running W/M injection this time around, along with the E&J RX7 apex seals and solid corners. Wondering if the solid corners were not necessarily a good idea as there seems to be some wear around the exhaust ports. Other than the exhaust port areas the sides and center look great. The rotor housings have no wear marks whatsoever. All apex seals are intact. I am sharing because there have been reports of these seals eating housings but I didn't experience that. The donor motor was a used junk yard pull and I didn't measure all the wear surfaces so I attribute the boost lag to either out of spec parts and/or more likely I probably didn't get things optimal since this was my first rebuild ever, rotary or otherwise.
There were two reasons I pulled it: a rattling noise and an oil leak between the front iron and front housing. The oil leak was at the top of the spark plug side, right where the oil goes through that dowel pin. Both o-rings seemed to be intact and in good shape, not pinched, etc. It didn't leak at first but it developed over time until about two weeks ago I parked at work and it deposited a nice oil pool on the ground. I didn't find any smoking gun inside. I Hylomar'ed the seals but being my first rebuild I probably didn't do it right...
As for the rattle, it had developed after I pulled the motor earlier this summer to replace the clutch bearing. It started very faint a few days after and grew to be very noticeable, however only while in boost. I pulled the car apart several times after that and could never find the culprit. Since the oil leak sprung I needed to pull it out anyway so I figured I'd tear down the motor and have a look. Nothing really... The only thing I found suspect was the oil chain is pretty slack. Perhaps it was slapping around under load. The rattle could have started prior to doing the clutch work and I just didn't notice it. For all I know the rattle could still be something non-motor related, we'll see...
For this round I picked up another reman, the thing looks brand new. The dealer said there were only 26 left in US inventory and they aren't making more. Not sure how accurate that is, but figured I'd snag one while I have the chance. $4275 + tax (plus $1K core) for those interested. Since they are likely going to be gone soon this may be my last reman and I'll have to get some practice doing my own rebuilds, given the way I abuse my car I am contemplating dropping in Goopy RX8 seals on this round, but still thinking about things. Winter has set in here so I have a few months....
There were two reasons I pulled it: a rattling noise and an oil leak between the front iron and front housing. The oil leak was at the top of the spark plug side, right where the oil goes through that dowel pin. Both o-rings seemed to be intact and in good shape, not pinched, etc. It didn't leak at first but it developed over time until about two weeks ago I parked at work and it deposited a nice oil pool on the ground. I didn't find any smoking gun inside. I Hylomar'ed the seals but being my first rebuild I probably didn't do it right...
As for the rattle, it had developed after I pulled the motor earlier this summer to replace the clutch bearing. It started very faint a few days after and grew to be very noticeable, however only while in boost. I pulled the car apart several times after that and could never find the culprit. Since the oil leak sprung I needed to pull it out anyway so I figured I'd tear down the motor and have a look. Nothing really... The only thing I found suspect was the oil chain is pretty slack. Perhaps it was slapping around under load. The rattle could have started prior to doing the clutch work and I just didn't notice it. For all I know the rattle could still be something non-motor related, we'll see...
For this round I picked up another reman, the thing looks brand new. The dealer said there were only 26 left in US inventory and they aren't making more. Not sure how accurate that is, but figured I'd snag one while I have the chance. $4275 + tax (plus $1K core) for those interested. Since they are likely going to be gone soon this may be my last reman and I'll have to get some practice doing my own rebuilds, given the way I abuse my car I am contemplating dropping in Goopy RX8 seals on this round, but still thinking about things. Winter has set in here so I have a few months....
Last edited by slash128; 11-24-2018 at 11:31 AM.
#2307
Registered
Did you by any chance empty your coolant anytime before that rattle developed?
The reason I am asking is that due to how high our engines rev if you get a tiny bubble or 2 of air in your heater core they seem to cause cavitation under high load and basically it sounds like metal ***** in a can anywhere above 7k rpm or thereabouts.
The reason I am asking is that due to how high our engines rev if you get a tiny bubble or 2 of air in your heater core they seem to cause cavitation under high load and basically it sounds like metal ***** in a can anywhere above 7k rpm or thereabouts.
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slash128 (11-30-2018)
#2308
n3rd
Thread Starter
I did when I pulled the motor for the clutch work, but I burped the system when I filled it. And it only happened in boost. I took out the wastegate springs and it never happened, even at redline. I've done coolant fills a few times now so I *think* I did it right, but I can't say for sure so....
#2309
Boosted Kiwi
iTrader: (2)
Yeah, I didn't blow this motor for a change, lol. I ran it hard at 17psi for the last 2 years and never had a detonation event that I was aware of, roughly 20K miles. It didn't quite build boost as quick as the remans I ran prior but when it kicked in it was still mean. I have been running W/M injection this time around, along with the E&J RX7 apex seals and solid corners. Wondering if the solid corners were not necessarily a good idea as there seems to be some wear around the exhaust ports. Other than the exhaust port areas the sides and center look great. The rotor housings have no wear marks whatsoever. All apex seals are intact. I am sharing because there have been reports of these seals eating housings but I didn't experience that. ....
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slash128 (11-30-2018)
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Brettus (11-24-2018)
#2315
Registered
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slash128 (11-30-2018)
#2317
n3rd
Thread Starter
I couldn't find any smoking gun for either the rattle or oil leak in my case. There was some wear around the periphery of the exhaust ports, similar to what you posted, which could have been the source of the rattle but I don't have any way to know for sure. This wear could have been due to the solid corner seals, also E&J.
As for the oil leak- I could find no cracks in the iron. But the o-ring that goes around the dowel appeared to be a bit flat, so could have been that.
I am not an experienced engine builder so either or both issues could have been a number of things attributed to my lack of experience. I plan to put some Goopy RX8 seals in this reman I picked up, hopefully I put it back together right I've got enough parts for another rebuild if I blow this one. I am not satisfied to live in the "safe" zone so I will continue to pay to play
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RotaryMachineRx (12-10-2018)
#2319
n3rd
Thread Starter
I looked pretty close at that area but didn’t find any cracks. I could have missed it. Anywho, it’s on its way back to Mazda as the return core on this reman.
#2322
Registered
I fixed my SSV rattle fairly easily, I am sorry I have no pics to show but if you have a look at yours you'll find that on the inside there is a backing plate that the bolts from the front screw into because it's all metal on metal contact some wear is bound to happen, what i did was add a very thin shim that I cut in the shape of this backing plate between the plate and the SSV valve body, I smeared heavy duty moly grease on it to insure a slower wear rate and put everything back together and there is no more rattle and that was nearly 2 years ago, if your engine is out I advise you to do it, I am sure you know pulling the SSV out is a bitch when the engine is in the car.