Heat exchanger issue
 

Hi - my heat exchanger has a small movement between the body and the pipes that leave it - should that be the case? On accelerating there is a burbling noise as if exhaust leak. Is this where it could be coming from? When running a constant speed there is no burbling noise!

There should be no movement. The HE should be rock solid tight to the engine. Can you post a video on youtube and link to here of the movement? The gurgling could definitely be an exhaust leak.

OP, it sounds like you have an exhaust leak, +1 post a video or pictures.

Hi - link is https://youtu.be/98fRdVVy-BM

You can see the body of the heat exchanger moving up and down the inlet tube. The exchanger tube is secure to the engine as I have checked all the nuts.

Thanks for you help......

Hi - posted here https://youtu.be/98fRdVVy-BM
Not great quality but you can see what is happening.

What year is your car?

1982 - I have posted a video, just waiting for the mod to clear it......

Okay. You can have some movement in the metal on the H.E's but that would be a tinny rattling sound. In some cases an off exhaust note can indicate a broken head stud. Does it make the noise more under heavy acceleration?

Yes - more noise under acceleration. Can't hear much when running at a constant speed. Engine was rebuilt 30 months ago and new heat exchangers installed.

Sound of head studs loose or broken because the 82 uses inserts into the heads so exhaust leaks aren’t like burned out exhaust gaskets of the thin flange heat boxes.
Bruce

How easy is it to check the studs?

Take your lower valve covers off and you'll be able to see the usual suspects. If the engine was rebuilt I doubt it's broken studs since they most likely would have been replaced.
If you're still using a 2 out 1 in exhaust I'd suggest checking all the joints and verify the exhaust barrel nuts are torqued appropriately.
If you can get the car up on a lift or on some jack stands, I'd get under it and look for any carbon deposits from a leak. If you've put any miles on the car, it should be pretty evident where the leak is.

Ok - thanks for your advice. Something to get my teeth into during the week.

OOPS! I meant two H.E's into a single point on the muffler, not two pipes out from the muffler. This is why I shouldn't post until after my second cup of coffee. Good luck! I hope you track it down.

Have a look at the issue...https://youtu.be/98fRdVVy-BM

HOLY SMOKES that's a lot of movement! The old rusty pair of H.E's I had didn't have that much play in them.

I know - the other side is rock tight. The rusty one I have in the garage is rock tight too. So .... is that the cause of the exhaust blow rather than a broken stud?

The stainless steel shroud does not get any exhaust, it just radiates and keeps heat from the pipe in so when you open the heater flaps it can blow in hot air to the cab.

Most likely the weld that held the HE in place broker off and taking pipe material with it.

Search for a good used one. Block off outlet and pour water into it, if it does not leak you will be good to go.

Sorry time to remove HS and replace. Make sure you get new nuts and gaskets, Might as well do both gaskets and inspect the other side for rust too.

I'm wondering if what you're hearing isn't a rattle. That shroud should never have exhaust gas in it since it's what delivers heat to the cab. Take a few finish nails for wood trim and place them between the exhaust ports and the shield just to hold the shield tight and then go drive it. I would find it hard to believe you have a head stud issue unless the original studs were used rather than replacing. Could still have a bad exhaust doughnut somewhere but I'd start by temporarily getting the shroud tight and see if the noise goes away.

Ok - tomorrow I will tighten it up with some exhaust putty and then go for a run to see what happens then. It could be that the HE is rubbing up and down on the pipe and making a noise (there is some noise in the video when I was moving it up and down). Be annoyed if I had to replace as this one was fitted new 30 months ago! Once again, thanks for your comments and advice. I will update asap.

I'd think that worst case you'll have to drop the HE and have a shop tack weld it back in place if that's what ends up being the problem.

Ok - so that was not the problem! The exhaust putty worked a treat and the exchanger is rock solid. will have to check for exhaust leaks from the whole system before taking things apart. Wondered if the cat had packed up?

Outstanding.

If cat clogged, you will feel it in poor acceleration or glowing red hot temps on the cat.

Look around for any carbon buildup on the exhaust joints and at the manifold gaskets. Like Draco said, if the cat was gummed up, you'd notice performance issues as well as a glowing hot cat. Good luck and keep us posted!

Will do - thanks for your support and advice......

Ok - so not an exhaust issue so have created a video of the sound when engine running. As you can hear, when increasing revs steadily no noise, give the accelerator peddle a pump and you can hear a noise - any ideas? Do you think it is a valve issue, ignition issue or (dreading this) a bearing issue?

https://youtu.be/QlETDee7s8c

Link to video doesn't appear to be working.

+1 Link broken, make sure it is in public to view

Sorry folks - link should now be working....ticked the wrong box!

Remove the lower valve covers and have a look at the head studs.

Uh oh,

Sounds like a head to case leak, maybe cam tower.

+1, remove covers and inspect studs or if you can do a leak down test. That will certain show a leak and pin point were it may be coming from.

Sorry to see your troubles Brother :-(

Thanks for the suggestions. Friend of mine suggested chain tensioner may have collapsed. What do you think?

Looks like a lot to investigate!

That is possible since you have the SC, if you do not know the complete history, you will not know if PO put a tensioner guard or updated them to a carrera oil fed ( you would see oil line going into the chain covers )

You can remove the covers and inspect the tensioners to make sure.

Hi everyone - just thought I would update on the issue. After a leak test two cylinders were well down so engine had to come out - no loose bits and pieces anywhere, studs all good etc. Problem has been identified as blown head gaskets - the springs inside two had gone bad and two others were in the process of failing. So - new gaskets purchased and ready to go in - just a question - is there a 'right way' for the gasket to go? One side appears flat and the other side slightly curved.

I don't recall. You might consider sending a PM to Bruce (flat6pac) or John Walker both would probably know for certain.

Thanks Cabmando - can't find flatpac6/John Walker PM as the area had been disabled by administrator! Can you provide a link for me?

Post a pic of your old gasket and new one.

Here is a picture of the one that blew -http://forums.pelicanparts.com/uploa...1538245894.jpg

Ooops - last post is a new one, this is one that blewhttp://forums.pelicanparts.com/uploa...1538246161.jpg

On a new one there is a 'flat' side which does not show up very well.