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Old 12-19-2020, 09:23 PM   #1
ETriggs
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Default Repair exhaust bolt hole

I have a 48 59AB that has a stripped out bolt hole for one of the exhaust holes. What would be the best way to repair that? Helicoil?
Thanks!
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Old 12-19-2020, 09:36 PM   #2
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Default Re: Repair exhaust bolt hole

This info. will help you decide what to do?
https://www.google.com/search?q=how+...hrome&ie=UTF-8
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Old 12-20-2020, 05:36 AM   #3
51 MERC-CT
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Default Re: Repair exhaust bolt hole

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I have a 48 59AB that has a stripped out bolt hole for one of the exhaust holes. What would be the best way to repair that? Helicoil?
Thanks!
Hope that you are aware that the (2) front bolts are a bigger dia. than the (4) rear bolts.
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Old 12-20-2020, 05:43 AM   #4
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Default Re: Repair exhaust bolt hole

^^ Yes, if it's a front one they have 7/16-14 thread if one of the others it's 3/8-16.

But if you have stripped one, I'd use a helicoil.

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Old 12-20-2020, 06:18 AM   #5
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Default Re: Repair exhaust bolt hole

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Hope that you are aware that the (2) front bolts are a bigger dia. than the (4) rear bolts.
I didnít know that! These motors came without exhaust manifolds so I didnít get a chance to pull the bolts out. Iím in the process of making an engine stand adapter to strip down the motors and the 3/8Ē bolt wouldnít hold on the front upper bolt. I assumed it was stripped. Thanks for the info! I am brand new to Flatheads, just starting to figure them out. I have 3 motors I bought in a package deal. 2 1948 59ABs and a 1942 motor.
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Old 12-20-2020, 10:26 AM   #6
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Default Re: Repair exhaust bolt hole

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Hey, great, that's what this forum is all about, sharing info and helping people. As you are new to it, don't hesitate to ask a question, it can save you a lot of grief. I've shared a lot of videos on youtube showing tearing down and rebuilding (more like putting back together) a couple of flatheads. Have a look. You might find something helpful.

Here's a link: https://www.youtube.com/user/martsrods/playlists
Crusty Flatty: https://www.youtube.com/watch?v=gUAS...nhHBvLs12GnGQu
Current flatty project: https://www.youtube.com/watch?v=JGGu...THMrri6-8w-LBI

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Old 12-20-2020, 11:03 AM   #7
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Thanks Mart! That’s my Sunday morning scheduled out perfectly!
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Old 12-20-2020, 12:20 PM   #8
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Default Re: Repair exhaust bolt hole

The exhaust area of the block may be very thin. Use caution removing any material. I have seen more than one leak coolant from a bolt hole.
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Old 12-20-2020, 01:03 PM   #9
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Default Re: Repair exhaust bolt hole

I is also very important to use the correct length bolts as most common ones are too short or too long.
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Old 12-20-2020, 01:10 PM   #10
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Default Re: Repair exhaust bolt hole

Thanks for the info. Always learning. Were the larger 7/16-14 bolts used in the front exhaust manifold bolts of all flatheads, more specifically the early, non-vented ones? I'm asking because I have a '34 motor that I plan to work on in 2021.
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Old 12-20-2020, 01:36 PM   #11
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Default Re: Repair exhaust bolt hole

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I is also very important to use the correct length bolts as most common ones are too short or too long.
I bought a handful of grade 8 3/8 that are 1 inch, it seems like the center bolts need to be shorter than that. Iím using 3/16Ē thick angle as the mount.
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Old 12-20-2020, 01:54 PM   #12
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Default Re: Repair exhaust bolt hole

Screw the bolt in and measure how much is sticking out. Then decuct your material thickness, take off a small amount so the bolt will not be bottomed out and make up the rest with washers.

To be honest, 3/16 doesn't sound very thick to me.

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Old 12-20-2020, 05:11 PM   #13
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Default Re: Repair exhaust bolt hole

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I bought a handful of grade 8 3/8 that are 1 inch, it seems like the center bolts need to be shorter than that. I’m using 3/16” thick angle as the mount.
If you plan to build the engine with all it's components, it will weigh around 500 lbs (depending on heads, manifold, etc). I would not hang that much weight on 3/16 angle iron - I would want a thickness of at least 1/4" - and probably 3/8" if I was making the exhaust mounted setup.
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Old 12-21-2020, 06:25 PM   #14
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Default Re: Repair exhaust bolt hole

I picked up some 3/8” thick 2” angle to use instead of the 3/16” 3” angle. I already made the brackets in the thinner stuff, so at least I know where the bolt holes go. It appears as though the left side exhaust is 1” forward of the right side, this sound correct?
Thanks all!
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Old 12-21-2020, 06:46 PM   #15
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Default Re: Repair exhaust bolt hole

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I picked up some 3/8” thick 2” angle to use instead of the 3/16” 3” angle. I already made the brackets in the thinner stuff, so at least I know where the bolt holes go. It appears as though the left side exhaust is 1” forward of the right side, this sound correct?
Thanks all!
Take a look at the relationship of two pistons and rods that are on the same rod journal and I think you will understand why one side is further forward than the other.
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Old 12-21-2020, 07:06 PM   #16
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Default Re: Repair exhaust bolt hole

ETriggs: I used stainless bolts and also socket head cap screw bolts with plenty of anti seize on both when installing my exhaust headers. Use only flat washers. Other wise bolts may come loose. I also have used bronze bolts successfully. Good luck and take your time. Also, go with 3/8 in. angle iron.
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Old 12-21-2020, 07:13 PM   #17
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Default Re: Repair exhaust bolt hole

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Take a look at the relationship of two pistons and rods that are on the same rod journal and I think you will understand why one side is further forward than the other.
Yep, understood about that but I wanted to make sure my 1Ē difference was close. Thanks!
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Old 12-21-2020, 07:50 PM   #18
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Default Re: Repair exhaust bolt hole

Here are the engines I’m working on. A 1941/2 engine with Fenton heads. This was close to running when I bought it. Two 1948 59ABs, one in good shape, one rusted up.

https://app.photobucket.com/u/ETrigg...e-3c06a917e99f

Last edited by ETriggs; 12-21-2020 at 07:56 PM.
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Old 12-21-2020, 08:59 PM   #19
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Default Re: Repair exhaust bolt hole

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Here are the engines Iím working on. A 1941/2 engine with Fenton heads. This was close to running when I bought it. Two 1948 59ABs, one in good shape, one rusted up.

https://app.photobucket.com/u/ETrigg...e-3c06a917e99f
The prettiest one! DD

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Old 12-21-2020, 10:37 PM   #20
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The prettiest one! DD
That one has a Stromberg EE-7/8 (81). The other came with an ordinary 97.
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