3.5L V8 Rover Engine - am I missing a part here? - Defender Source
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  #1  
Old April 2nd, 2013, 03:11 PM
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3.5L V8 Rover Engine - am I missing a part here?

Guys,

I have a 3.5L V8 Rover Engine ('83), with a carburetor. Whenever I'm driving, I get an intense exhaust leak smell, sometimes causing pounding headaches... I looked in the engine bay, and it looks like the passenger side exhaust manifold has been modified in the past, letting exhaust leak freely into the engine bay...attached are the pictures for reference. Can anyone tell me what's going on here? Thanks.
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  #2  
Old April 2nd, 2013, 03:19 PM
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If that's what I think it is then it isn't actually open to the exhaust gasses. It looks like a pre-heater for the inlet. There would have been a pipe from the front of the truck to one of the holes, the other would go to the intake air cleaner. The air passes over the manifold and gets warmed up before it goes into the engine. Its a cold weather mod.

Been a long time since I seen one though so you might want to check. It should not be open to the exhaust gasses in the manifold.

Edit - That's probably not the original air cleaner. The original would have been enclosed and had a single pipe inlet. The hose from the manifold would attach to that in cold weather.
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Old April 2nd, 2013, 03:23 PM
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Quote:
Originally Posted by BEIS View Post
Guys,

I have a 3.5L V8 Rover Engine ('83), with a carburetor. Whenever I'm driving, I get an intense exhaust leak smell, sometimes causing pounding headaches... I looked in the engine bay, and it looks like the passenger side exhaust manifold has been modified in the past, letting exhaust leak freely into the engine bay...attached are the pictures for reference. Can anyone tell me what's going on here? Thanks.
Have someone close off the exit pipe (tail pipe) at the very end of the vehicle and you should be able to see and or feel the leak.
Then fit it or have it fixed.

Quote:
Originally Posted by ipgregory View Post
It looks like a pre-heater for the inlet... the other would go to the intake air cleaner. The air passes over the manifold and gets warmed up before it goes into the engine. Its a cold weather mod..
Exactly
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Old April 2nd, 2013, 03:25 PM
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I have heard about the cold weather mod before...However, those open pipes and it being so close to the exhaust manifold kind of made me think that it was somehow connected to the exhaust causing the intense exhaust smell.

So I take it, that those pipes are not connected to the exhaust? Sure looks like it.

Also, should those pipes be plugged?

I've never seen another Rover V8 that has this...
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Old April 2nd, 2013, 03:27 PM
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Originally Posted by BEIS View Post
So I take it, that those pipes are not connected to the exhaust? Sure looks like it. Also, should those pipes be plugged?
No and no
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Old April 2nd, 2013, 03:28 PM
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Quote:
Originally Posted by rdavisinva View Post
Have someone close off the exit pipe (tail pipe) at the very end of the vehicle and you should be able to see and or feel the leak.
Then fit it or have it fixed.



Exactly
Good call man. I'll try that out. What's a good blocker for the exhaust pipe?

Sorry for the stupid question, just trying to DIY.

------ Follow up post added April 2nd, 2013 02:29 PM ------

Quote:
Originally Posted by rdavisinva View Post
No and no

Thanks, Robert. I'm a newbie at engine maintenance.
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Old April 2nd, 2013, 03:29 PM
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Quote:
Originally Posted by BEIS View Post
I have heard of that before...However, those open pipes and it being so close to the exhaust manifold kind of made me think that it was somehow connected to the exhaust causing the intense exhaust smell.

So I take it, that those pipes are not connected to the exhaust? Sure looks like it.

Also, should those pipes be plugged?

I've never seen another Rover V8 that has this...
Easy to check like Robert says. Block off one of them and see if you have exhaust gasses coming out. Its possible the manifold is cracked and bleeding into it. They were pretty common on older cars in the UK.

Trying to remember if there was an early version of EGR that had a flap or something in there to let exhaust back into the inlet. Don't think there was but its possible and the flap could be stuck open or something.

Either way it should be pretty easy to verify if you have exhaust coming out of there with the engine running.
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Old April 2nd, 2013, 03:46 PM
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What to use to block the pipe...

Use some old cotton rags or cotton shop towels or bath towels.
Nothing that was used with flammable liquids or that is made of paper.
I usually wet them first and wear a glove to protect my hands.
Exhaust gas is hot.
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Old April 2nd, 2013, 03:52 PM
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Yall are great. I'll try all of this out, and post the outcome. Thanks!
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Old April 2nd, 2013, 03:57 PM
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Quote:
Originally Posted by BEIS View Post
Good call man. I'll try that out. What's a good blocker for the exhaust pipe?

Sorry for the stupid question, just trying to DIY.

------ Follow up post added April 2nd, 2013 02:29 PM ------




Thanks, Robert. I'm a newbie at engine maintenance.
Come on guys this is the oldest prank world wide, you never shoved a potato up some kids exhaust pipe before, kinda funny watching the out come.

Kinda like running a leaded pencil down a spark plug, this works best on motorcycles
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Old April 2nd, 2013, 04:05 PM
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Oh, I'm not plugging the exhaust pipe completely. Just enough to see where that leak is and so it doesn't stall out.

I'm aware of that potato prank, hah.
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Old April 2nd, 2013, 04:11 PM
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Potato in the pipe damage...

Quote:
Originally Posted by roverman2010 View Post
Come on guys this is the oldest prank world wide, you never shoved a potato up some kids exhaust pipe before, kinda funny watching the out come.
It can do harm like blow out seals or damage the muffler internally...
Think you were probably kidding, but not a good practice.
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Old April 2nd, 2013, 04:43 PM
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Seems you are missing the original air filter canister/output to the engine
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Old April 2nd, 2013, 04:55 PM
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Quote:
Originally Posted by MUDSUX View Post
Seems you are missing the original air filter canister/output to the engine

I guess those pipes were idled by a previous owner, and the carb takes the filter canister's place. Thanks for the pictures MUDSUX!
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Old April 2nd, 2013, 04:55 PM
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With the removal of the original carbs and aircleaner for the use of the round air cleaner and (I assume) a Holley or similar carb and manifold, I expect that almost all of that stuff had to be removed.

Murph

------ Follow up post added April 2nd, 2013 04:57 PM ------

You can also use a little bit of Seafoam or similar fuel system cleaner. You'll clearly see smoke from where the leak is.

Looking at your photos again, the original dual carb setup and manifold was replaced with an Edelbrock manifold and probably an Edelbrock 1401 or the like carb.

On my first Defender-thing hybrid that had a 3.5 V8, the original carbs and manifold on it were pretty thrashed when I bought it. I bought the Edelbrock manifold like that one (for a Buick V8), 1401 carb and sweet wrinklecoat air cleaner. Then, to really put the cherry on top, I found a set of billet adapters from the UK that allow the use of US musclecar valve covers, and added the Edelbrock valve covers, too. It looked like a musclecar engine and ran pretty good.
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Old April 2nd, 2013, 04:58 PM
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Ian is right. There would have been hoses attached inbetween to the two carbs and the air filter. There would have been valves on the hoses that closed when hot, but when not enough allowed drawing in air over the exhaust manifold to aid in cold running. But this has nothing to do with smelling fumes. Janey had these, but don't have any pictures handy

Quote:
Originally Posted by ipgregory View Post
If that's what I think it is then it isn't actually open to the exhaust gasses. It looks like a pre-heater for the inlet. There would have been a pipe from the front of the truck to one of the holes, the other would go to the intake air cleaner. The air passes over the manifold and gets warmed up before it goes into the engine. Its a cold weather mod.

Been a long time since I seen one though so you might want to check. It should not be open to the exhaust gasses in the manifold.

Edit - That's probably not the original air cleaner. The original would have been enclosed and had a single pipe inlet. The hose from the manifold would attach to that in cold weather.
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Old April 2nd, 2013, 05:10 PM
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Ryan, when I fitted that intake and carb for Derek- what 5 years now maybe?-I had put the original air filter housing and all of the bits in the car.
The carb has fuel mixture screws to adjust the amount of fuel used in the idle circuits. Sounds to me from what you've described, she may be just a touch rich.
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Old April 2nd, 2013, 05:15 PM
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Originally Posted by Roverlab View Post
Ryan, when I fitted that intake and carb for Derek- what 5 years now maybe?-I had put the original air filter housing and all of the bits in the car.
The carb has fuel mixture screws to adjust the amount of fuel used in the idle circuits. Sounds to me from what you've described, she may be just a touch rich.
Trevor

Trevor! There you are! Thanks for chiming in. Yea those parts that were in there are unfortunately long gone. It's been restored, bulkhead swapped, frame swapped, moved across the U.S. twice, and stored for a couple years...so those things naturally go missing hah. Just now...after 5 years, I'm getting to use it on a regular basis. PM me your phone number if possible, would love to catch up.
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Old April 2nd, 2013, 06:20 PM
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My 83 110 has the same set up on the manifold, they do not let exhaust through unless the manifold is cracked open at that exact spot.
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Old April 3rd, 2013, 10:23 AM
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All, found the exhaust leak. It is underneath the cold weather mod... Where the manifold connects with the exhaust pipe. I think (hope) it's a loose connection, and not a blown gasket seal. Didn't have the right deepwell sockets to make it work last night. I think tightening it to see if it's a lose fitting is the first step...crossing my fingers that I don't break it off, or round off the bolt....
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