Full Flow oil.
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=156584
Printed Date: 15 May 2025 at 2:24pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Full Flow oil.
Posted By: ctbowles58
Subject: Full Flow oil.
Date Posted: 21 Dec 2018 at 8:41pm
What year or at what ser # did the D17 go to the "Full Flow" oil system ?
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Replies:
Posted By: Kevin in WA
Date Posted: 21 Dec 2018 at 8:48pm
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SN 24,000 and up had full flow, mid 59 or so, black bar grill tractors.
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Posted By: DrAllis
Date Posted: 21 Dec 2018 at 10:25pm
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Effective on G-226 engine s/n of 17-19978 and up.
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Posted By: SteveM C/IL
Date Posted: 22 Dec 2018 at 9:47am
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But over the years many mods happen so not unusual to find a full flow in an older one. Just look at system to identify when viewing tractors.
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Posted By: DrAllis
Date Posted: 22 Dec 2018 at 4:24pm
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There was a point in time where the old style G-226 blocks were discontinued and the full-flow block was the only replacement.
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Posted By: SteveM C/IL
Date Posted: 22 Dec 2018 at 11:22pm
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My cousin has a 57 or 8 that has a full flow in it.Bought used of course so don't know the history.
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Posted By: DrAllis
Date Posted: 22 Dec 2018 at 11:45pm
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If the block doesn't have a s/n behind the carb, it was a new block from the parts dept.
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Posted By: Lonn
Date Posted: 23 Dec 2018 at 8:43am
When I worked at the Allis dealership the older mechanics told me that they converted several early D17 engines over to full flow.
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Posted By: DrAllis
Date Posted: 23 Dec 2018 at 8:46am
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I'd bet most of them had spun the center main bearing, ruining the block at the center main area. The factory change to full flow did two things: kept engine oil CLEAN and increased oil pressure because the oil pump speed was increased. Just changing the block to the full-flow style got you cleaner oil. To increase the oil pressure required a new camshaft and an oil pump driven gear on top.
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Posted By: Bill Deppe/AC Salvag
Date Posted: 23 Dec 2018 at 12:36pm
Would another reason to increase more volume to the larger diameter mains?
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Posted By: DrAllis
Date Posted: 23 Dec 2018 at 3:52pm
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The Engineers made a mistake in the early G-226 engines in my opinion. They provided engine oil 100% of the time to the rod bearings. This was to increase rod bearing life with the increased compression/power pressure and RPM's of the new engine. On a W-201/W-226 the rod bearings were only oiled 1/6 or 1/3 of the time (don't remember which one). So, they soon found out that as the G-226 got some wear on the bearings(including cam brgs), they didn't carry any oil pressure. This was the reason for increasing the oil pump speed was to provide more volume (GPM's) to keep up with the demand of 100% rod bearing oiling.
By the time they got to the Series 4 engine with the "Tufftrided" crankshaft journals, most of the time the crankshaft didn't even need to be reground at the first overhaul. Just slip in new main bearings (at -.001 under) and standard rod bearings and you were good to go. Now, if you had a Customer who was terrible on oil changes and regular maintenance, this might not be true.
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