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Tech Area => General Buick Tech => Topic started by: gnonyx on February 15 2020, 12:50:59 PM

Title: Donut between downpipe and elbow
Post by: gnonyx on February 15 2020, 12:50:59 PM
Is there another donut that would be an oversize compare to the normal size stock?
 After tuning and adjustment was made I did notice some exhaust was expelling around the donut area.
 The donut was replaced and the stock bolts with spring are max out
Title: Re: Donut between downpipe and elbow
Post by: Grumpy on February 15 2020, 01:03:52 PM
did you use both pieces ??  :chin:
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 15 2020, 01:06:25 PM
did you use both pieces ??  :chin:
What do you mean by both pieces?
Title: Re: Donut between downpipe and elbow
Post by: reality on February 15 2020, 05:48:03 PM
THE pipe is fubared. You might try hammering the flange closed or put a sleeve in.
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 15 2020, 05:58:39 PM
THE pipe is fubared. You might try hammering the flange closed or put a sleeve in.
Can you define sleeve in
Title: Re: Donut between downpipe and elbow
Post by: reality on February 15 2020, 06:29:13 PM
If I said shim the flange would that help? The pipe under the gasket is ''stretched''.
Title: Re: Donut between downpipe and elbow
Post by: nocooler on February 15 2020, 06:43:45 PM
Did you loosen the 4 bolt flange that connects to the y-pipe before you tightened the bolts to the turbo elbow? Make sure to support downpipe with jack stand or jack. Both with make it easier to line up properly and take all the weight/tension off the flange while you snug everything back up. 
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 15 2020, 06:52:18 PM
If I said shim the flange would that help? The pipe under the gasket is ''stretched''.
shim I understand
Dump question, but how does a steel pipe flange gets stretched when it's only to tighten a donut against an exhaust elbow?
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 15 2020, 07:02:23 PM
Did you loosen the 4 bolt flange that connects to the y-pipe before you tightened the bolts to the turbo elbow? Make sure to support downpipe with jack stand or jack. Both with make it easier to line up properly and take all the weight/tension off the flange while you snug everything back up.
I'm not familiarize with the 4 bolt flange that connects to the y-pipe since all was good until I replaced the intermediate pipes and mufflers. I didn't disconnected the flange donut connection while doing the muffler replacement, but then realized the downpipe was loose from all the movement of putting the muffler back together again. I place a jack underneath the hollow converter, and replaced the donut with a new one. Jack the converter upward enough to start the downpipe flange bolts.
Title: Re: Donut between downpipe and elbow
Post by: Grumpy on February 16 2020, 09:48:01 AM
Ill get a pic later today.
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 16 2020, 11:48:40 AM
Ill get a pic later today.
Okay Thanks
Title: Re: Donut between downpipe and elbow
Post by: Grumpy on February 16 2020, 03:27:23 PM
here ya go
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 16 2020, 03:56:10 PM
here ya go
I appreciate the photo of an exhaust donut, but I can't read the number, can you please post the number
Thanks
Title: Re: Donut between downpipe and elbow
Post by: Grumpy on February 17 2020, 05:29:28 AM
i posted it so you can see the piece that goes inside the donut. i doubt the part # will do any good .. its prob 25 years old. sorry the damm pics were so big.
Title: Re: Donut between downpipe and elbow
Post by: Steve Wood on February 17 2020, 10:05:48 AM
I don't know if this is both parts, or not    https://www.highwaystars.net/gasket-turbo-exhaust-downpipe-gm-1262500/ (https://www.highwaystars.net/gasket-turbo-exhaust-downpipe-gm-1262500/)

Autozone and others sell the Walker donut replacement.

When I had a stock dp, I used to put a thin coat of high temp copper rtv on it before bolting it down
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 17 2020, 12:19:31 PM
I don't know if this is both parts, or not    https://www.highwaystars.net/gasket-turbo-exhaust-downpipe-gm-1262500/ (https://www.highwaystars.net/gasket-turbo-exhaust-downpipe-gm-1262500/)

Autozone and others sell the Walker donut replacement.

When I had a stock dp, I used to put a thin coat of high temp copper rtv on it before bolting it down
Hi Steve, Do you have ESP?

Last night I was taking to my wife about calling highwaystars on their GM downpipe donut, and last night I also found a tube of Versachem Mega Copper high-temp silicone

I already called highwaystars, and ordered their donut gasket is a GM product since it's not an after market type
I also ordered a egr gasket since I'm going to totally remove the egr system. I only did half the system by disconnecting the vacuum, but now I will remove all of egr associations.
I will keep you posted of results
Now go play some Lotto :rock: :rock: :rock:
Title: Re: Donut between downpipe and elbow
Post by: Steve Wood on February 17 2020, 12:58:01 PM
LOL, be very careful when you block off the EGR that you have sealed the opening off.  It can be difficult with a block off plate so use some high temp and glue it down and it might stay sealed
Title: Re: Donut between downpipe and elbow
Post by: Scoobum on February 17 2020, 02:15:47 PM
Eric disables the EGR via his chip. It won't kick a code.
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 17 2020, 05:33:32 PM
Eric disables the EGR via his chip. It won't kick a code.
I already know that when I electrically disconnected the EGR
My chip is from Full Throttle Bob Bailey
Thanks
Title: Re: Donut between downpipe and elbow
Post by: gnonyx on February 17 2020, 05:40:56 PM
LOL, be very careful when you block off the EGR that you have sealed the opening off.  It can be difficult with a block off plate so use some high temp and glue it down and it might stay sealed
I torque down the intake which it didn't needed it, and also remove the EGR valve. If you look are the picture there is moisture around the edge of the EGR valve as well as on the edge of the copper gasket.
I also from highwaystars the EGR gasket and as highwaystars descriptions:
This unique high-temperature GM gasket is made of the same graphite material as original GM Vin 7 Turbo Regal head gaskets and is not available anywhere else
[/size]I will still Hi-temp RTV on both sides of the gasket.

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