Swapping Exhaust Manifolds
#21
The following 2 users liked this post by Nobeel Masri:
Cafcpete (12-10-2020),
motorcarman (12-09-2020)
#22
Nobeel- I would consider going back with the Payen exhaust manifold gasket https://www.partsgeek.com/catalog/19...l#immersedview , it is significant thicker than the OEM gasket and may work better to seal the mating surfaces. I used these on my Jag turbo project after discovering a small leak near the firewall after cold starts using OEM gaskets. I switched to this gasket design (significantly thicker) and no more leaks. If you are joining two perfectly flat surfaces then either design will work; my response is to advise you and others there is an alternate exhaust gasket design.
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someguywithajag (12-20-2020)
#23
Hi bsparkman,
It looks like the one I took off the donor car was this thicker type with the hatched dot pattern. I have no idea how long it was on there, but it was a good seal, no carbon marks out from the ports.
I already ordered the OEM metal gasket and am making sure I have the right surface roughness.
I've yet to look at the car it's going into, but will make sure everything is squeaky clean for the install.
I found a great article which shows a specific roughness for the manifold surface. Seems as long as its flat, then the roughness should be from a 100 grit sandpaper.
Does anyone have any more information on the required roughness for the manifold and OEM gasket?
http://www.leftlanebrain.com/cylinder-head-resurfacing/
compression ring type (Permatourque) – Aluminum head on iron block
30 – 60 Ra. 50-60 Ra preferred.
It looks like the one I took off the donor car was this thicker type with the hatched dot pattern. I have no idea how long it was on there, but it was a good seal, no carbon marks out from the ports.
I already ordered the OEM metal gasket and am making sure I have the right surface roughness.
I've yet to look at the car it's going into, but will make sure everything is squeaky clean for the install.
I found a great article which shows a specific roughness for the manifold surface. Seems as long as its flat, then the roughness should be from a 100 grit sandpaper.
Does anyone have any more information on the required roughness for the manifold and OEM gasket?
http://www.leftlanebrain.com/cylinder-head-resurfacing/
compression ring type (Permatourque) – Aluminum head on iron block
30 – 60 Ra. 50-60 Ra preferred.
Last edited by Nobeel Masri; 12-17-2020 at 11:57 PM.
The following 2 users liked this post by Nobeel Masri:
944play (12-18-2020),
someguywithajag (12-20-2020)
#24
Hi,
I finally received the last of the gaskets and got stated on the install.
It was all going well until I ran into the rounded/stripped nut at the back of the rear manifold. After a few slipped wrench attempts and trying with a socket from below I decided to pull the cats and the rear manifold out to get to it. After borrowing a jack and stands I was able to get under and remove it all. Then it was a case of cleaning up and reassembly. It took a couple of hours to get it all back together and running.
The engine seems to be running smoother and mpg's appear to be better already after a few short runs.
Thank you all for the great advice. It really helps to know you are out there for support.
Pulled cast and rear manifold
I tried, but it was far too gone. Vice grips did the rest
Finally
Rear installed
Front installed
Done
I finally received the last of the gaskets and got stated on the install.
It was all going well until I ran into the rounded/stripped nut at the back of the rear manifold. After a few slipped wrench attempts and trying with a socket from below I decided to pull the cats and the rear manifold out to get to it. After borrowing a jack and stands I was able to get under and remove it all. Then it was a case of cleaning up and reassembly. It took a couple of hours to get it all back together and running.
The engine seems to be running smoother and mpg's appear to be better already after a few short runs.
Thank you all for the great advice. It really helps to know you are out there for support.
Pulled cast and rear manifold
I tried, but it was far too gone. Vice grips did the rest
Finally
Rear installed
Front installed
Done
Last edited by Nobeel Masri; 01-06-2021 at 12:27 AM.
The following users liked this post:
SleekJag12 (01-06-2021)
#25
#26
#27
I thought it might be useful to show the condition manifold downpipe nuts that came off. The wear marks are from install and uninstall as far as I know only once.
The new nuts seem a lot more solid, the old ones feel kind of brittle. Does the metal weaken with the temperature hikes?
I was sure I had a good hold on them when removing them, so was surprised at the damage they took.
I guess if it says single use, use it once only.
The new nuts seem a lot more solid, the old ones feel kind of brittle. Does the metal weaken with the temperature hikes?
I was sure I had a good hold on them when removing them, so was surprised at the damage they took.
I guess if it says single use, use it once only.
The following users liked this post:
Cafcpete (01-08-2021)
#28
#29
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