Exhaust ports and sealing...., ..how do you know? |
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Exhaust ports and sealing...., ..how do you know? |
falcor75 |
Feb 23 2017, 12:50 PM
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#1
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Senior Member Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia |
How do you know you get a good seal at the exhaust port?
The only way to really know is to take down the heaterbox and look for soot on the copper gaskets. But by then you will need to anneal the gasket again and hope that you get a good seal the next time you mount the heater box too.... Tips and tricks are most welcome.... |
Rand |
Feb 23 2017, 05:16 PM
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#2
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
QUOTE OK this might be crazy but what about a torque wrench? Nothing crazy about that! The nuts should absolutely be tightened appropriately. For anyone who isn't sure what that feels like, a torque wrench is important. The mating surfaces being clean and flat is most important. I've seen all kinds of things, from old gaskets left in, to erosion that started because of leaks at the head. Exhaust leaks at that location are a time bomb. Sometimes the tops of the pipes need filing to make sure the surfaces are flat and smooth. (Long file strokes across both pipe ends at the same time (per side pair) to make sure they are flat with each other.) Sometimes you need to keep the rear mounts loose so you can adjust the angle as you torque at the heads to preserve the flat mating at the heads first before tightening up the rest. Depends on your exhaust system though - this is why I love stub pipes. |
Bartlett 914 |
Feb 24 2017, 10:05 AM
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#3
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Advanced Member Group: Members Posts: 2,216 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
Sometimes the tops of the pipes need filing to make sure the surfaces are flat and smooth. (Long file strokes across both pipe ends at the same time (per side pair) to make sure they are flat with each other.) Sometimes you need to keep the rear mounts loose so you can adjust the angle as you torque at the heads to preserve the flat mating at the heads first before tightening up the rest. Depends on your exhaust system though - this is why I love stub pipes. One has to be careful doing this. You really need a BIG file. A standard 12" file is too short. I have seen where this has created a problem that may not have been there before. It is very easy to get these surfaces uneven. I have a surface plate I can use. I use abrasive paper on the plate (or a really good flat surface) and sand the ends in smooth strokes. I feel going in a single direction works best. Using a permanent marker can help see the high spots. You need two sets of hands works best here or a good way to hold the paper in place while working. |
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