Trunion bearing Q. - Pirate4x4.Com : 4x4 and Off-Road Forum

Eskimo · 04-25-2003, 10:20 AM

Yup, I searched for knuckle bearing and trunion bearing...

When I installed the "cup" that the trunion bearing sits in, it sticks up out of the housing about 3mm. It is the same on all 4, so I'm guessing it's OK?

It's been so long since I initially tore this thing down that I forgot what it looked like before, but I don't really trust that, either.

I guess I'm at stage V on the SO/SR/WB stretch... paranoia.

cruiserbrett · 04-25-2003, 10:27 AM

Those look like they have less taper than the Koyo ones I have. Mine sit closer to flush with the housing...

Are those timken bearings by chance? I once tried a timken cross for the koyo and it was like that.

-Brett

Eskimo · 04-25-2003, 10:35 AM

90% sure they are timken.. off the top of my head.

Pin Head · 04-25-2003, 10:43 AM

They don't look right. Besides the taper issue the race looks too high. Check the number. They should be 30303B and not just 30303.

Diesel_Cruiser · 04-25-2003, 10:47 AM

Mine also sit closer to flush with the housing, i measured an old bearing cup and it was 10.5 mm.
Brand is KOYO #TR0305A

Bad angle, but you get the idea.

RockinWagin · 04-25-2003, 12:17 PM

Definitely non OK--You will never get the knuckle back together.

cruiserman · 04-25-2003, 01:32 PM

Rich, As others have said, it's sitting too high. Look under the cup and see if it's sitting flush against the recess in the knuckle ball. If you can see or feel a gap, no good. Go with Koyo bearings.

Eskimo · 04-25-2003, 01:38 PM

Hrmmm.. They are actually SKF bearings..German made. Came with the rebuild kit I got.

Called JTO, and they mentioned that the SKF bearing race does sit up a bit higher than the Koyo's, but have never had a reported problem.

I'm still gonna pope them out and make sure there's no garbage in there preventing the race from sitting further down.

Thanks for the input.

GloNDark · 04-25-2003, 01:39 PM

What no blue?

Mine sat pretty close to flush.

RockinWagin · 04-25-2003, 01:39 PM

Quote:

Originally posted by cruiserman
Rich, As others have said, it's sitting too high. Look under the cup and see if it's sitting flush against the recess in the knuckle ball. If you can see or feel a gap, no good. Go with Koyo bearings.

When I saw his picture, I thought "that race is not all the way in and it looks crooked." But he said all 4 were this way and I thought "nah, couldn't be all four that way." Must be wrong bearing set. So meybe its the blue paint that makes this happen.

cruzila · 04-25-2003, 02:32 PM

I don't like the look of that. There is no reason other than cost not to have the right bearing in the kit. Stock bearings fit flush with the top or below. Secondly and not least important is the height of the bearing halfs together. If that is off, shiming for center and preload will be impossible. Preload is highly important if you do not want to have your knuckle arms fall off on the road.

Get it wrong and the studs will break for certain. Measure the height of the old ones and the replacements. Of course you will have to remove one cup to do that. I have seen at least 2 different types of factory OEM bearings. Overall they are the same, but if you switch cups or rollers they will be way off!!

If they are the same height as stock and you can get the knuckles over them, go ahead and use them. But keep the old ones as spares and keep the sets together!!

Scott

Eskimo · 04-25-2003, 06:02 PM

Well, I pulled them all off, and it's the same. BUT, I can easily get the knuckles on.

The old ones are the same too. I won't sweat it. I think it's just this particular bearing combo. Preload WILL be checked... 5lbs...

And for the record, I'm replacing the bearings and the races...

maddog · 04-25-2003, 06:27 PM

Like you said "I'm still gonna pope them out and make sure there's no garbage in there preventing the race from sitting further down". ditto

Slowerthanu · 04-25-2003, 06:38 PM

Ewwww, so close to being road worthy and getting tickets for scaring wildlife with that blue paint

. Should be AWESOME with a 101" wheelbase

Eskimo · 04-26-2003, 08:54 AM

Quote:

Originally posted by maddog
Like you said "I'm still gonna pope them out and make sure there's no garbage in there preventing the race from sitting further down". ditto

Did that, and although they were sitting flush before, I feel better about it. as I'm wheeling/driving, I freqently have mental images of what the parts are doing, and I dont' want to worry about any of that...

If I was thin-skinned, I'd paint the axles black... But I'm not, so

to all of ya's..

BJ On Roids · 04-26-2003, 05:00 PM

Quote:

Originally posted by maddog
Like you said "I'm still gonna pope them out and make sure there's no garbage in there preventing the race from sitting further down". ditto

thats all id do, then paint the housings black and run it!!

04-25-2003, 10:20 AM	#1 (permalink)
Eskimo Registered User Join Date: Mar 2002 Member # 10429 Location: Danville, PA Posts: 4,456	Trunion bearing Q. Yup, I searched for knuckle bearing and trunion bearing... When I installed the "cup" that the trunion bearing sits in, it sticks up out of the housing about 3mm. It is the same on all 4, so I'm guessing it's OK? It's been so long since I initially tore this thing down that I forgot what it looked like before, but I don't really trust that, either. I guess I'm at stage V on the SO/SR/WB stretch... paranoia. Attached Images __________________ Rich Q. FJ-40 Cruggy - tuned 5.3/4WS rockwells/linked/ORI's/42's

04-25-2003, 10:27 AM	#2 (permalink)
cruiserbrett Registered User Join Date: Sep 2001 Member # 6863 Location: San Diego Posts: 2,797	Those look like they have less taper than the Koyo ones I have. Mine sit closer to flush with the housing... Are those timken bearings by chance? I once tried a timken cross for the koyo and it was like that. -Brett __________________ I have enough projects for the next decade. Need two?

04-25-2003, 10:35 AM	#3 (permalink)
Eskimo Registered User Join Date: Mar 2002 Member # 10429 Location: Danville, PA Posts: 4,456	90% sure they are timken.. off the top of my head. __________________ Rich Q. FJ-40 Cruggy - tuned 5.3/4WS rockwells/linked/ORI's/42's

04-25-2003, 10:47 AM	#5 (permalink)
Diesel_Cruiser Registered User Join Date: Jan 2002 Member # 9390 Location: Belgium Posts: 456	Mine also sit closer to flush with the housing, i measured an old bearing cup and it was 10.5 mm. Brand is KOYO #TR0305A Bad angle, but you get the idea. __________________ Christof M. from Flanders, Belgium 1980 Bj40, home built shackle reversal, rollcage, Lj70 front discs, Bj60 Power steering,... 1978 blonde, no need for any upgrades :-) Al Bundy: " This is what being a man is all about, making mistakes and not caring!!" Last edited by Diesel_Cruiser; 04-25-2003 at 10:49 AM.

04-25-2003, 01:32 PM	#7 (permalink)
cruiserman Registered User Join Date: Aug 2000 Member # 1527 Location: Idaho Posts: 1,034	Rich, As others have said, it's sitting too high. Look under the cup and see if it's sitting flush against the recess in the knuckle ball. If you can see or feel a gap, no good. Go with Koyo bearings. __________________ 80, '72 GMC, Odyssey

04-25-2003, 10:43 AM	#4 (permalink)
Pin Head Registered User Join Date: May 2001 Member # 4783 Location: Orange Co. CA Posts: 1,797	They don't look right. Besides the taper issue the race looks too high. Check the number. They should be 30303B and not just 30303.

04-25-2003, 12:17 PM	#6 (permalink)
RockinWagin Registered User Join Date: Oct 2002 Member # 14366 Location: Texas Posts: 311	Definitely non OK--You will never get the knuckle back together.

04-25-2003, 01:38 PM	#8 (permalink)
Eskimo Registered User Join Date: Mar 2002 Member # 10429 Location: Danville, PA Posts: 4,456	Hrmmm.. They are actually SKF bearings..German made. Came with the rebuild kit I got. Called JTO, and they mentioned that the SKF bearing race does sit up a bit higher than the Koyo's, but have never had a reported problem. I'm still gonna pope them out and make sure there's no garbage in there preventing the race from sitting further down. Thanks for the input. __________________ Rich Q. FJ-40 Cruggy - tuned 5.3/4WS rockwells/linked/ORI's/42's Last edited by Eskimo; 04-25-2003 at 01:39 PM.

04-25-2003, 01:39 PM	#9 (permalink)
GloNDark Pirate4x4 Addict! Join Date: Dec 2000 Member # 2482 Location: Yo momma house Posts: 11,731	What no blue? Mine sat pretty close to flush. __________________ GET IT Dave!! save me a spot bro......i'll miss you...

04-25-2003, 02:32 PM	#11 (permalink)
cruzila Pirate4x4 Addict! Join Date: Aug 2001 Member # 6650 Location: Garden Valley Posts: 5,384	I don't like the look of that. There is no reason other than cost not to have the right bearing in the kit. Stock bearings fit flush with the top or below. Secondly and not least important is the height of the bearing halfs together. If that is off, shiming for center and preload will be impossible. Preload is highly important if you do not want to have your knuckle arms fall off on the road. Get it wrong and the studs will break for certain. Measure the height of the old ones and the replacements. Of course you will have to remove one cup to do that. I have seen at least 2 different types of factory OEM bearings. Overall they are the same, but if you switch cups or rollers they will be way off!! If they are the same height as stock and you can get the knuckles over them, go ahead and use them. But keep the old ones as spares and keep the sets together!! Scott __________________ Scott Johnston Rubicon Trail Foundation Founding Director and Past President 2010-2012 WIN a fully built Toyota pickup at Cantina 2013 Davez Off Road and Trail Gear are supporting Rubicon Trail Foundation

04-25-2003, 06:02 PM	#12 (permalink)
Eskimo Registered User Join Date: Mar 2002 Member # 10429 Location: Danville, PA Posts: 4,456	Well, I pulled them all off, and it's the same. BUT, I can easily get the knuckles on. The old ones are the same too. I won't sweat it. I think it's just this particular bearing combo. Preload WILL be checked... 5lbs... And for the record, I'm replacing the bearings and the races... __________________ Rich Q. FJ-40 Cruggy - tuned 5.3/4WS rockwells/linked/ORI's/42's

04-25-2003, 06:27 PM	#13 (permalink)
maddog Registered User Join Date: Feb 2000 Member # 281 Location: Victorville, CA Posts: 2,365	Like you said "I'm still gonna pope them out and make sure there's no garbage in there preventing the race from sitting further down". ditto __________________ Take care and happy trails to ya, maddog.

04-25-2003, 06:38 PM	#14 (permalink)
Slowerthanu Registered User Join Date: Dec 2002 Member # 15372 Location: Utah Posts: 1,034	Ewwww, so close to being road worthy and getting tickets for scaring wildlife with that blue paint . Should be AWESOME with a 101" wheelbase __________________ "Is that justice?" "Just remember, you are unique............Just like everybody else!"

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