Piston Question
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=167374
Printed Date: 24 Sep 2025 at 1:53am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Piston Question
Posted By: TMiller/NC
Subject: Piston Question
Date Posted: 13 Jan 2020 at 3:21pm
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What is the significance of the "notch" in top of piston?  |
Replies:
Posted By: Sugarmaker
Date Posted: 13 Jan 2020 at 3:24pm
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Tim, My guess is that it faced forward in the tractor?? Regards, Chris ------------- D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet. |
Posted By: jaybmiller
Date Posted: 13 Jan 2020 at 3:26pm
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Maybe points toward front of engine, an 'alignment' mark ?? Hay, it's been a very long while since I was in Grade 9 autoshop !! now, am I right ? Did I remember something good from highskool ?? ------------- 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 |
Posted By: Boss Man
Date Posted: 13 Jan 2020 at 6:45pm
| What motor? Usually means that goes towards the front of motor. I remember there being a motor that the rods were clamped offset on the wrist pins and the notch was to make sure the right offset was in the right hole so the wrist pin didn't rub on the sleeve |
Posted By: TMiller/NC
Date Posted: 13 Jan 2020 at 8:32pm
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It's a B engine with 3 7/16" liner and pistons............... I was so happy to get picture posted I forgot to tell engine size... Thanks, Tim
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Posted By: MACK
Date Posted: 14 Jan 2020 at 7:29am
| Some pistons have off set wrist pins for a different angel to crankshaft, so notch indicates front of engine. MACK |
Posted By: TMiller/NC
Date Posted: 14 Jan 2020 at 11:20am
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Thanks for the replies |
Posted By: Dick L
Date Posted: 14 Jan 2020 at 12:30pm
| Most notches indicate the oil drain holes in the ring grooves. The notches were not present in the original pistons and I personally have never given there position the slightest attention in this engine. In the slant 6 and the V8 engines I placed the notch or stamped arrow toward the outside. |