Super sprag failure
#2092250
06/15/16 07:36 AM
06/15/16 07:36 AM
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Joined: May 2012
Posts: 169 Finland, Europe
Ck[FIN]
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My friends 727 broke behind his 550+cid 900hp+ big block. It started to lock the tires after launch and i found broken sprag. Never first gear burnouts. car broke rear end last summer, maybe broke the sprag too. valve body does have band on first gear. Also got aluminum drum. In my opinion, the super sprag worked like it should even if it broke, didnt roll over, just got stuck and stopped the car. https://drive.google.com/open?id=0B33OAqkGbjVpcVE2YVQ0OWY4VjRZeVM1NXE1SXBFc1B2cHVR
Last edited by Ck[FIN]; 06/15/16 07:38 AM.
-1965 Valiant 9.03s 358cu.in R5P7-
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Re: Super sprag failure
[Re: Ck[FIN]]
#2092283
06/15/16 09:50 AM
06/15/16 09:50 AM
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Joined: Aug 2005
Posts: 760 Southington Ct.
turbobitt
super stock
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super stock
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Southington Ct.
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Hard to see but it looks like it wasn't getting any lube oil. Is that bluing on the inner race ? Do the rollers look like they have wear prior to the damage ? If there is wear due to lack of lube oil I wonder if it would have been beneficial to drill a small lube oil hole from the lube feed passage. AG.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Super sprag failure
[Re: turbobitt]
#2092417
06/15/16 01:34 PM
06/15/16 01:34 PM
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Joined: Jan 2003
Posts: 75,020 U.S.S.A.
JohnRR
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I Win
Joined: Jan 2003
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U.S.S.A.
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Hard to see but it looks like it wasn't getting any lube oil. Is that bluing on the inner race ? Do the rollers look like they have wear prior to the damage ? If there is wear due to lack of lube oil I wonder if it would have been beneficial to drill a small lube oil hole from the lube feed passage. AG. I add that tiny hole on every 727 I build.
running up my post count some more .
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Re: Super sprag failure
[Re: John_Kunkel]
#2092564
06/15/16 05:19 PM
06/15/16 05:19 PM
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Joined: May 2012
Posts: 169 Finland, Europe
Ck[FIN]
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Yes there is an extra lube hole. This is 4k Coan transmission, about 100passes. Front drum return springs were all over the place. Clutches like brand new.
Last edited by Ck[FIN]; 06/15/16 05:28 PM.
-1965 Valiant 9.03s 358cu.in R5P7-
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Re: Super sprag failure
[Re: Ck[FIN]]
#2092615
06/15/16 06:57 PM
06/15/16 06:57 PM
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Joined: Jan 2003
Posts: 25,817 Rio Linda, CA
John_Kunkel
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Like turbobitt said, the burn marks are strange and extend pretty near all the way around the visible inside of the race. I'd want to mike the surviving rollers to check for flat spots.
What does the rear band look like?
The INTERNET, the MISinformation superhighway
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Re: Super sprag failure
[Re: John_Kunkel]
#2092618
06/15/16 07:12 PM
06/15/16 07:12 PM
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Joined: May 2012
Posts: 169 Finland, Europe
Ck[FIN]
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Its reverse vb. I,ll take some more photos of the sprag for you to analyze. Rear band is like new, still says hd kevlar in it.
-1965 Valiant 9.03s 358cu.in R5P7-
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Re: Super sprag failure
[Re: mafo]
#2092870
06/16/16 09:03 AM
06/16/16 09:03 AM
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Joined: Aug 2005
Posts: 760 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 760
Southington Ct.
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In my opinion this looks like a lube circuit failure. It appears to have a lot of wear and galling. I would start by looking at the rear roller support and make sure the seals are doing there job and contacting the appropriate surfaces. Put the tail shaft back in with the output shaft and see what is happening between the bearings, seals and relief cuts in the shaft. At this point it may be a good idea to send compressed air through the lube supply and see if there are any undesirable leaks. Then I would work my way through the system and make sure the cooler is not clogged and maybe inspect the valve body. AG.
Last edited by turbobitt; 06/16/16 09:08 AM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Super sprag failure
[Re: turbobitt]
#2092900
06/16/16 10:18 AM
06/16/16 10:18 AM
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Joined: May 2012
Posts: 169 Finland, Europe
Ck[FIN]
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Could be a lube problem, i'll check those oil passages and seals. Maybe a bigger lube hole also?
-1965 Valiant 9.03s 358cu.in R5P7-
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Re: Super sprag failure
[Re: Ck[FIN]]
#2092905
06/16/16 10:37 AM
06/16/16 10:37 AM
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Joined: Aug 2005
Posts: 760 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 760
Southington Ct.
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I don't think the lube hole is the problem and the fact that it already has one is probably overkill in a perfect lube oil situation. It just looks to me as if its not getting any oil to that hole whatsoever. It appears as if the rollers wore so bad that they eventually rolled over, jammed or ejected with the springs because of the reduction in size. Any time a roller rear support is used carefully attention to the lube circuit and alignment of the sealing areas on the output shaft must be taken. As a precautionary measure, I would inspect the planets and make sure the gears have minimal radial play(as an indication of needle bearing and shaft wear). If it is a lube failure and has been running like this for a while the planetaries may be starting to take a beating. AG.
Last edited by turbobitt; 06/16/16 10:43 AM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Super sprag failure
[Re: Ck[FIN]]
#2093110
06/16/16 06:28 PM
06/16/16 06:28 PM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
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Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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Definitely a lube problem.. yikes.
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