yudaya

has anyone on here ever had a problem with spinning bearings in their motor this is the second time this has happened, the first time i lost an oil cooler line on the freeway and didn't notice my oil pressure had dropped to 0 till about a mile later. but this time i spun both rotor bearings but they acualy spun and destroyed the inner part of the rotor so they acualy stayed on my e-shaft when i pulled the rotor out ..... just trying to figure out why this happened any ideas???

bumpstart

E shaft pellet fail

if your doing stat gear bearings regularly = wrong counter weights

yudaya

sorry forgot to mention details, stat gear bearing are fine, i have thew atkins thermal pelet replacement, the solid silver one(cant remeber what its called right now) also large streetport and polish,new apex seals and corner seals and all new springs .its an 87 na motor used all the same parts, set endplay with correct spacer, had put all new bearings in, broke in motor for 1800 miles the first time, after the second rebuild drove for almost 3k miles before one day heard knocking in motor knew it was bearings again.

bumpstart

well, apart from some random metal still floating around the system

- do you start and warm up on a bad slope?
is your ignition AOK?
ie-- sure the trailing is operational ??
is TDC right????


are you loosing coolant via outer ring into oil cavity?
is your sump evaporative control still working-
-- ie due you have a water in oil issue?

is your oil unusually thinned by very rich mixes??

Craiger

iTrader: (1)

Did you replace your oil pump after spinning the bering the first time? If not, I would suspect that when the berings spun the first time dammage was done to your oil pump and therefore it was a ticking time bomb.

Aaron Cake

iTrader: (1)

Did you replace the oil pump and thoroughly clean out the inside of the cooler after the first failure?

What weight of oil are you running?

Any oil mods?

How was the bearing pressed in? The correct way is to warm the rotor and freeze the bearing, then quickly press it in with a bit of green/grey Loctite to hold it in place.

http://www.aaroncake.net/rx-7/damage.htm

Barry Bordes

^2nd this, also.......Did you clean the metal out of the e-shaft?
Barry

yudaya

No, the first time i spun a bearing was a totally different motor.
i did not clean the oil cooler out, the mods i have on this motor, i believe was the oil pressure regulator crush mod or whatever its called saw it on pineapple racing. but i did not do the mod myself it was already done when car was bought.

i had no water in oil issues. no coolant loss besides a loose hose clamp to the heater core. i run 20w-50 oil. i premix. i have all blockoff plates. motor had originally been rebuilt by atkins had new front cover and many other new parts. motor was running in my friends car for more than a year before we turbo swapped.

knowing that i did not flush out the cooler was most likly my problem but what is the proper was to flush one?

thank for all the reply's.

Barry Bordes

Flush both directions with varsol in a wash tank. We had a special pump for aircraft oil coolers that could change directions of flow. After an hour of cleaning we would tap the tank ends lightly to shake any remaining particles loose.

If I remember correctly there was place that cleaned and x-rayed them in Dallas. Southwest Oilcooler I think.

Barry

arghx

iTrader: (3)

A friend spun a rotor bearing. His timing was horribly off due to a mismatched pulley and hub.

yudaya

hmmm well my timing seemed fine and ran great

g14novak

iTrader: (1)

Personally, I think you should have hit it with a timing light just to make sure it was right before you drove it around for 3k miles...

FYI, the car can be off timing by almost 4 or 5 teeth and still run. I had a friend with one like that, spun a bearing, found out he was off almost 30 degrees on his timing.

yudaya

i hit it with a timing light and it was around 10 degress off i had set the cas to factory settings but a few times it had slipped due to the nut not being tightened all the way

g14novak

iTrader: (1)

So it was 10 degrees off but it still rode fine? Ever hear any knocking at high rpm?

If you can weld, I'd suggest modifying the CAS so it doesn't change at all when you put the motor back together.

killahrx7

i've spun bearings before and when i did i would get a different cooler. never spun a bearing because of timing before, never seen it either(as there are alot of things i haven't seen). another thing that can cause that is unbalanced rotating assembly. just my 2 cents as i'm no genius here.

g14novak

iTrader: (1)

The motor will knock if the timing is off and if you just ignore it, it will eventually spin a bearing. A unbalanced rotating assembly is usually more famous for taking out the stat gear bearing, which his is fine.

To OP, when you reassemble the engine, make sure you cleaned out all the oil passages, and clean out the oil cooler as well. Possibly even get another one off of one of the members in the classifieds.

yudaya

thasnks for all the replies, i just received another oil cooler and am currently cleaning out my motor irons and oil pump, so the culprit was my stupid oil cooler from the previous motor. thanks for all the help.

bumpstart

12aT mazda fuel pump washer in action, flushing oil cooler with diesel

- no sock, just distance, and a little magnet chucked in on the discharge banjo