tap for exhaust manifold
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=209632
Printed Date: 10 Jan 2026 at 1:00am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: tap for exhaust manifold
Posted By: jaybmiller
Subject: tap for exhaust manifold
Date Posted: 08 Jan 2026 at 7:34am
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OK, trying to clean up the garage and found some big taps, got me thinking, pretty sure some here posted what size tap can be used for threading the exhaust manifold on a D-14 or maybe a B ? I just hate to toss out these taps IF that can be used by someone. Jay update. finally found one of them, says 2" , 1 1/2 NPT. Has 2-3 missing teeth otherwise in VGC !
------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Replies:
Posted By: IBWD MIke
Date Posted: 08 Jan 2026 at 7:44am
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Not sure about a 14 but a D-17 takes a 1&1/2" pipe tap. I don't scrap a tap until it's broken generally speaking. Don't tap enough holes to make one dull these days.
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Posted By: Les Kerf
Date Posted: 08 Jan 2026 at 9:34am
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I bought a 1-1/4" pipe tap specifically for my Model C manifolds, works great! |
Posted By: KJCHRIS
Date Posted: 08 Jan 2026 at 2:37pm
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1 1/2" npt on D17 S3 gas. 2" npt on AC 180 / 185. IHC M- 560 gas. ------------- AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B, |
Posted By: steve(ill)
Date Posted: 08 Jan 2026 at 4:56pm
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keep them around.. those come in handy when working on OLD PLUMBING drains... also bilge pump - irrigation pumps suction and discharge ports.. old rusty pump cases can be repaired.. ------------- Like them all, but love the "B"s. |
Posted By: AveryD12
Date Posted: 08 Jan 2026 at 6:15pm
| Can a D12 III manifold be tapped? I haven’t had much luck with the original setup. The muffler stabs into the manifold and has two bolts that bolt thru a flange on the side (for lack of a better term) into the manifold. If it can be threaded and a pipe nipple screwed into it I could secure a muffler with a muffler clamp |
Posted By: IBWD MIke
Date Posted: 09 Jan 2026 at 6:36am
I would think they could be. You would have to check the I.D. and see if it's close to tap-drill size. It might be interesting trying to cut threads into cast iron that has been heat cycled a zillion times.
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AveryD12 wrote: