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Carburetor problems
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Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
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How might I know if it works? If indeed that is what it is.
Tere


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3174 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
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Captain Doom
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I don't think it's an exhaust brake (gaso engines don't benefit from them because the throttle plate - when closed - produces the same effect of turning the engine into a compressor).

A possibility is that it's part of the emissions control system.


Rusty


MilSpec AMG 6.5L TD 230HP; built-to-order by Peninsular Engines:  Hi-pop injectors, gear-driven camshaft, non-waste-gated, high-output turbo, 18:1 pistons.  Fuel economy increased by 15-20%, power, WOW!"StaRV II"

'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP

Nelson and Chester, not-spoiled Golden Retrievers

Sometimes I think we're alone in the universe, and sometimes I think we're not.
In either case the idea is quite staggering.
- Arthur C. Clarke

It was a woman who drove me to drink, and I've been searching thirty years to find her and thank her - W. C. Fields
 
Posts: 8201 | Location: Brooker, FL, USA | Member Since: 09-08-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 4/08
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I agree with Rusty in not much benefit in a gas engine. Whatever it was it has been wired open. But it looks like it was a vacumn activated butterfly valve.

They did sell exhaust brakes for gas engines years ago, but don't know anyone who bought one.


'92 Barth Breakaway - 30'
5.9 Cummins (6B) 300+ HP
2000 Allison
Front entrance
 
Posts: 924 | Location: Minneapolis/Yuma | Member Since: 08-17-2006Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
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I think you are looking at a vacume controled heat riser control valve. It stays closed when engine is cold forcing hot exaust to flow thru bottom of intake to other exaust pipe to aid in preheating intake faster.vacume line should go to temp sensor then to vacume source. Make sure butterfly is free and vacume diaphram will pull in if you hook it up to direct vaccume.Stuck in the closed position not a good thing. Stuck in open position will only keep intake frome heating up as fast. On older engines this use to have a bimetalic spring that open them up.


1986 31' Regal -1976 Class C
454/T400 P30 -350/T400 G30
twin cntr beds - 21' rear bath
 
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Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
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quote:
Make sure butterfly is free and vacume diaphram will pull in if you hook it up to direct vaccume.


I guess I'd have to remove it to look at it?! Will removing it to look at it damage anything? I don't want to start something I can't finish. If so & the diaphram is faulty should I put another one on (if I can find) or will it be ok without? Then where would I hook up the vacuum hose?

Other ??'s about fuel pump:

To get the right fuel pump I will need to have one that is compatible with the fuels we have today, it will have to have a return line on it, & what is the gallons per minute I am looking for?

When I remove fuel pump I will remove hoses first, then remove from engine. When I remove the two bolts holding it on will it come out fairly easily? Looks like there is a hook thingy that goes into the block to hold it. Does the hook thingy have any other purpose?

I have marine grade fuel hoses. Is there any down side to running the hose from the fuel pump to the fuel filter in one long run? The marine grade is a little less flexible than the normal fuel hoses. Of course it will be a splice @ fuel filter then a short run to the switching unit.

I would like to do the same from the sw unit to the rear tank. We are going to drop the tank first & have it sent out for cleaning & recoating.

Seems like i should have a short run of hose (3')from tank to fuel filter then a long hose to sw unit.
Right now the filter is up close to the sw unit. Probably doesn't matter to much.

Ok to buy fuel pump & vacuum modulator from NAPA, Advance or Summit or Classic Industries or GM?

Any thing else I should have on hand before I get started?

I will be taking carb out & sending to Oscar Heritz in OHIO, but know that taking it off requires being able to put it back on when the rebuilt one arrives. Any suggestions. My son in law says to use masking tape & # the vacuum hoses etc(like a clock) but there is a lot of other stuff I have to undo.

I'll certainly take a lot of pics for reference too.


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3174 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
FKA: noble97monarch
Supporting Member of Barthmobile.com 3/12
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quote:
I think you are looking at a vacume controled heat riser control valve.

Doorman,

Thanks for reminding me what that things was called, I was wracking my brain trying to recall. I once bought a 454 Monte Carlo from a guy who said the engine was going south. It would make a loud ticking noise until warmed up, diagnosis; bad rod bearing. Truth, it was the heat riser valve needing lubrication (that one was on a spring that heated up).

Thanks,

Corey




Formerly: 1997 Barth Monarch
Now: 2000 BlueBird Wanderlodge 43' LXi Millennium Edition DD Series 60 500HP 3 stage Jake, Overbuilt bike lift with R1200GS BMW, followed by 2011 Jeep Wrangler Unlimited,
“I haven’t been everywhere, but it’s on my list.”
 
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Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
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Truth, it was the heat riser valve needing lubrication (that one was on a spring that heated up).


How do I lubricate it?


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3174 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
FKA: noble97monarch
Supporting Member of Barthmobile.com 3/12
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quote:
How do I lubricate it?

Jim,

It looks like someone has wired it open. That would indicate it was hanging up closed, which restricts your exhaust flow. You could try to make it functional again, although yours is a vacuum operated one and therefore more complex. I would leave it be if you have no cold start issues.

Corey




Formerly: 1997 Barth Monarch
Now: 2000 BlueBird Wanderlodge 43' LXi Millennium Edition DD Series 60 500HP 3 stage Jake, Overbuilt bike lift with R1200GS BMW, followed by 2011 Jeep Wrangler Unlimited,
“I haven’t been everywhere, but it’s on my list.”
 
Posts: 2307 | Location: Laurel Park, NC | Member Since: 03-16-2008Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
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Jim,

Didn't notice wire. I leave it alone, but would trace vacume line back to source and plug just in case the diaphram is leaking. It helps in cold weather, but you're going to get rid of it when you put your new Doug Thorley Headers on any way.

Doorman


1986 31' Regal -1976 Class C
454/T400 P30 -350/T400 G30
twin cntr beds - 21' rear bath
 
Posts: 779 | Location: Dayton, Ohio | Member Since: 09-27-2009Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
Picture of Jim and Tere
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quote:
but you're going to get rid of it when you put your new Doug Thorley Headers on any way.


We already have Doug Thorley Headers. I will trace & plug the vacuum hose.


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3174 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
Picture of Jim and Tere
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Just ordered a Bosch Fuel pump & a B&M vacuum modulator. Not sending carb in until I test the new fuel pump.

Rear tank is ready to drop, just need my son in law to take a break from triplets to help me lower. There are some brake lines that are attached to a clamp on the rear axle that I will let him undo. I don't want to damage brake lines.

After we were somewhat "repaired" & we were limping home we stopped for fuel. Turned off engine. Filled up fr tank & then tried to start. Nothing! Tried Aux battery, Nothing! Switched back from aux batt & waited 30 sec, it started right up. My son in law said the older Chevys were notorious for this. We have a metal heat shield on our starter & he suggested a thermo blanket. Where might I acquire one of these?
Tere


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3174 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
Picture of Jim and Tere
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I "sidewalk superintended" the removal of the fuel pump last night. Just below the fuel pump is what GM calls a "push rod". It is about 1/2" in diameter and about 4" long. It is held is place by a square bolt. This push rod moves the fuel pump rocker arm back and forth. Should we replace the rod along with the fuel pump? It looks to be in good shape.
Jim


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3174 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 2/16
Captain Doom
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Not necessary - the fuel pump follower is softer than the operating rod, and any wear would be on it - but they're both bathed in oil, so wear is very, very rare.


Rusty


MilSpec AMG 6.5L TD 230HP; built-to-order by Peninsular Engines:  Hi-pop injectors, gear-driven camshaft, non-waste-gated, high-output turbo, 18:1 pistons.  Fuel economy increased by 15-20%, power, WOW!"StaRV II"

'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP

Nelson and Chester, not-spoiled Golden Retrievers

Sometimes I think we're alone in the universe, and sometimes I think we're not.
In either case the idea is quite staggering.
- Arthur C. Clarke

It was a woman who drove me to drink, and I've been searching thirty years to find her and thank her - W. C. Fields
 
Posts: 8201 | Location: Brooker, FL, USA | Member Since: 09-08-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/12
Formally known as "Humbojb"
Picture of Jim and Tere
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Oscar Heritz has rebuilt the carb and it's on the way back to us. Our plan is to finish up the fuel lines to the mid tank and fire it up to see if our problem is solved. Oscar said he didn't find a lot of junk in the carb but it did have some other problems that might have caused the problem. We'll see. I feel guilty taking up so much room on the "tech forum", what with four different subjects. Really appreciate all the help.
Jim


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
 
Posts: 3174 | Location: madisonville tn usa | Member Since: 02-19-2005Reply With QuoteReport This Post
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Supporting Member of Barthmobile.com 8/16
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quote:
Originally posted by Jim and Tere:
I feel guilty taking up so much room on the "tech forum", what with four different subjects.
I wouldn't worry about it. Computer


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