tips/tricks for fitting stainless steel heat exchangers |
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tips/tricks for fitting stainless steel heat exchangers |
jmargush |
Aug 7 2013, 02:07 PM
Post
#1
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Member Group: Members Posts: 460 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
Getting ready to attach the heat changers to my heads that came from HAM.
Doesn't appear that they are going fit right up easily. Does anybody have any tips or tricks for getting them to fit? Do they normally require some convincing to go on? |
r_towle |
Aug 7 2013, 04:12 PM
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#2
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Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
three fitment issues I have had.
At the studs, fix is to dremel out the loop on the HE to make it line up. I have never seen a new stud that is bent, but plenty of crooked holes in heads, cross threaded studs, and poor insert alignment. Easiest to tweak the HE at that point... I have had to remove and move on loop on one HE....the rest have been close enough to make fit. At the head, fix is to ensure both parts of the HE that touch the head are flat and on the same plane... Heat up and anneal the copper gasket to make it crush better. At the muffler, this just takes some twisting to get things to line up perfectly or the gasket will leak. I have used two gaskets per side on one car...just cause it works. I bolt up the HE to the heads while hanging the rear loose on the bracket only, with no muffler. Only after I am done, tight and torqued to the head do I introduce the weight of the muffler into the mix. oh, as stated in the previous post, it will leak the first time. If it leaks at the head,...remove the muffler and fix that issue with no weight on it. Rich |
914_teener |
Aug 7 2013, 10:33 PM
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#3
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914 Guru Group: Members Posts: 5,205 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
three fitment issues I have had. At the studs, fix is to dremel out the loop on the HE to make it line up. I have never seen a new stud that is bent, but plenty of crooked holes in heads, cross threaded studs, and poor insert alignment. Easiest to tweak the HE at that point... I have had to remove and move on loop on one HE....the rest have been close enough to make fit. At the head, fix is to ensure both parts of the HE that touch the head are flat and on the same plane... Heat up and anneal the copper gasket to make it crush better. At the muffler, this just takes some twisting to get things to line up perfectly or the gasket will leak. I have used two gaskets per side on one car...just cause it works. I bolt up the HE to the heads while hanging the rear loose on the bracket only, with no muffler. Only after I am done, tight and torqued to the head do I introduce the weight of the muffler into the mix. oh, as stated in the previous post, it will leak the first time. If it leaks at the head,...remove the muffler and fix that issue with no weight on it. Rich (IMG:style_emoticons/default/agree.gif) Leaned this trick to get them to seal: 1. Apply a thin coat of copper based RTV to each gasket. 2. Pop the gaskets in the heads and let them sit for a bit. 3. Apply another bead of RTV...this time let your finger create a bead and let it set up a bit. 4. Fit up the HE's and torque them to spec by evenly tightening them. Note: Make sure they will fit up prior....which is what stage you are at now. |
jmargush |
Aug 8 2013, 04:15 AM
Post
#4
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Member Group: Members Posts: 460 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
three fitment issues I have had. At the studs, fix is to dremel out the loop on the HE to make it line up. I have never seen a new stud that is bent, but plenty of crooked holes in heads, cross threaded studs, and poor insert alignment. Easiest to tweak the HE at that point... I have had to remove and move on loop on one HE....the rest have been close enough to make fit. At the head, fix is to ensure both parts of the HE that touch the head are flat and on the same plane... Heat up and anneal the copper gasket to make it crush better. At the muffler, this just takes some twisting to get things to line up perfectly or the gasket will leak. I have used two gaskets per side on one car...just cause it works. I bolt up the HE to the heads while hanging the rear loose on the bracket only, with no muffler. Only after I am done, tight and torqued to the head do I introduce the weight of the muffler into the mix. oh, as stated in the previous post, it will leak the first time. If it leaks at the head,...remove the muffler and fix that issue with no weight on it. Rich (IMG:style_emoticons/default/agree.gif) Leaned this trick to get them to seal: 1. Apply a thin coat of copper based RTV to each gasket. 2. Pop the gaskets in the heads and let them sit for a bit. 3. Apply another bead of RTV...this time let your finger create a bead and let it set up a bit. 4. Fit up the HE's and torque them to spec by evenly tightening them. Note: Make sure they will fit up prior....which is what stage you are at now. Engine is still on the stand I want to try to assemble the exhaust while it is on the stand since it will be so much easier to get everything to fit right instead of working overhead |
eyesright |
Aug 8 2013, 07:26 AM
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#5
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Member Group: Members Posts: 430 Joined: 8-January 12 From: OK Member No.: 13,979 Region Association: Southwest Region |
Engine is still on the stand I want to try to assemble the exhaust while it is on the stand since it will be so much easier to get everything to fit right instead of working overhead [/quote] Good,...you are doing it the easy way where you can see all the spots where the flange binds on the studs (maybe) or the head recess. Len did my heads too and I wondered if the studs were skewed when I couldn't get the pipes to fit up into the recess without binding. Upside down, under the car, low jackstand clearence, poor light....I finally could see that the pipes/flanges were binding against the recess in the heads. Some filing on the side of the flange and they slipped right into place. The studs were perfect...of course. Early or late HE's (mine's a '76) keep filing until they slide right on and don't forget to flatten the mating surface with a file or stone. Good luck. |
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