D-14 oil filter/ block ?
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=209946
Printed Date: 21 Mar 2026 at 9:03pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D-14 oil filter/ block ?
Posted By: Wes(Va)
Subject: D-14 oil filter/ block ?
Date Posted: 01 Feb 2026 at 10:05pm
| Have had this engine apart for some time. Original tractor had a hole in the side of the block from a rod coming loose. Found a donor D-14, and pulled its engine apart and found good used sleeves and pistons to put in. Im stumped on the oiling system.. the block has two ports on the right hand side like for the full flow system, but I have a bypass filter base. Its been apart for a while and I cant remember 100% but am pretty sure this filter was on this engine. Would it have had a plug in the lower hole and run the bypass filter? Should I find a bypass filter setup? There is a plunger in the front of the cam |
Replies:
Posted By: DrAllis
Date Posted: 01 Feb 2026 at 10:47pm
| I'd have to research this to give you an accurate answer. Going from memory, the early G-149's were bypass filters. The later G-149's and all G-160's are full flow filter design. The oil pumps were different. Camshaft was the same but I think the ball/spring and thrust device was different at the front of the cam.....The full flow block has different oil flow passages. Too late in the day. This has to be done right or bad things will happen. What's the s/n on the left side behind the carb ?? G-149 or G-160 ?? |
Posted By: Wes(Va)
Date Posted: 02 Feb 2026 at 11:51am
| Its a full flow block. Checked the serial nuber pad and its blank, so possibly a replacement block at some point? This oil pump doesn't have a check ball in the driveshaft. Has 3.5" crater pistons in it. I think I may have a full flow filter base that I thought was off of the original D17 around here, and maybe it came off this engine! Man its been 10+ years since I took this apart! |
Posted By: Kenny L.
Date Posted: 02 Feb 2026 at 8:50pm
|
The good Dr. is right. |
Posted By: Wes(Va)
Date Posted: 06 Feb 2026 at 1:56pm
OK! so, don't think its a full flow block. Didn't know the difference was the hole or no hole behind the oil filter base. This block has a hole behind the filter housing, but also has two ports down on the right hand side (which is why I called it a full flow block) I have a relief valve in the front end of the camshaft. I believe I am going to plug the lower hole and run it.
|
Posted By: Allis dave
Date Posted: 06 Feb 2026 at 4:26pm
| Just make sure you blow some air or something through those holes to make sure you know where the paths are going and where you have oil. Dr helped me convert my WD45 to full flow about 10 years ago. It was a fun project. |
Posted By: PaulB
Date Posted: 06 Feb 2026 at 7:13pm
Your block is a FULL FLOW FILTER block. Running it at a BYPASS system: DO YOU FELL LUCKY??? ------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Wes(Va) wrote:Posted By: DrAllis
Date Posted: 06 Feb 2026 at 9:56pm
| I think that would work, but I'm not there looking at the block either. As long as you use a bypass oil pump and filter base, and there is a path for oil to enter the block from the filter base, plugging that lower hole should be correct. Again, I ain't there looking at it. |
Posted By: steve(ill)
Date Posted: 07 Feb 2026 at 4:33pm
|
isnt the drain hole from the filter mount , back to SUMP a giveaway that this is a Bypass system ??? I dont know, but i dont think the drain hole would be present on a full flow block ? No need for it ? ------------- Like them all, but love the "B"s. |
Posted By: DrAllis
Date Posted: 07 Feb 2026 at 5:24pm
| Yes. It is still there and has a steel ball driven into it so it's plugged. |
Posted By: SteveM C/IL
Date Posted: 07 Feb 2026 at 11:55pm
| I tapped an allen pipe plug in on my45 when converting to full flow. |
Posted By: Wes(Va)
Date Posted: 08 Feb 2026 at 6:40am
| Thanks for that clarification! The steel ball. I will look for that. I have original allis service manuals, but I wasnt seeing any mention of this in there. |
Posted By: DrAllis
Date Posted: 08 Feb 2026 at 7:00am
| If the drain back hole (in the block) from behind the filter base is open, the ball has been removed, which is what you want for your oiling system. |
Posted By: steve(ill)
Date Posted: 08 Feb 2026 at 8:00am
|
is there actually a drain hole in the filter head of the Full Flow system ?? I know its not needed, but is there actually a way for the oil to get out of the filter head ? ------------- Like them all, but love the "B"s. |
Posted By: DrAllis
Date Posted: 08 Feb 2026 at 8:37am
| Not on a full-flow filter. Oil in and out by steel tubes. |
Posted By: Les Kerf
Date Posted: 08 Feb 2026 at 8:39am
|
I couldn't find any info on the D14 but I found a manual for the H3 which I believe is the same engine.   Hope this helps
|
Posted By: steve(ill)
Date Posted: 08 Feb 2026 at 8:58am
|
yea... that all makes sence.. just didnt understand why the ball is in the not-used hole...there is no oil at that point..... unless its just a reminder that the block has been modified to full flow ------------- Like them all, but love the "B"s. |
Posted By: Wes(Va)
Date Posted: 08 Feb 2026 at 11:14am
| No ball in this block. Thanks Les for the diagram. Thanks everybody else for your help and those that called. I don't feel lucky, I now feel informed! |
Posted By: steve(ill)
Date Posted: 08 Feb 2026 at 12:52pm
|
Just to add a little info.. this is from the Original Allis B-C manual The BYPASS system still has a pressure feed crank shaft main bearings.. The Crank is NOT DRILLED to feed the connecting rods..The hollow cam shaft is full of oil and there are holes in it pointed at the connecting rods that SPRAY oil on to the connecting rod bearings on the crank and wrist pin..   ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 08 Feb 2026 at 12:55pm
|
so.......... the CAM on a BYPASS system should have SPRAY HOLES... and the CRANK on a PRESSURE system should have drilled holes to the conecting rods ????????? ------------- Like them all, but love the "B"s. |
Posted By: DrAllis
Date Posted: 08 Feb 2026 at 3:45pm
| B-C-CA-RC engines use the spray oil for the rod bearings. The G-138-149-160 engines are all pressure lube to the rod even tho the oil filter is bypass design. Full-flow oil filtering didn't come til the G-149 in a D-15, not D-14. |
Posted By: toddhinIN
Date Posted: 10 Feb 2026 at 8:23am
| I have a D14 - G149 bare block on the stand ready to reassemble, would it be a good idea to convert it to a full flow while i have it torn down? Besides a late D15 filter housing what would it take to convert? Thanks in advance. |
Posted By: steve(ill)
Date Posted: 10 Feb 2026 at 6:14pm
|
the BYPASS shoves oil from the pump , thru the cam shaft... The FULL FLOW uses a bigger pump and pushes the oil OUT of the engine, thru the filter, then back INTO the engine.... so you need the housing, a few oil lines, and plug a couple holes at a minumum... read this... different engine, but good reading.. https://www.allischalmers.com/forum/wd45-full-flow-oiling-conversion-how-to_topic127481.html" rel="nofollow - https://www.allischalmers.com/forum/wd45-full-flow-oiling-conversion-how-to_topic127481.html
------------- Like them all, but love the "B"s. |
Posted By: Wes(Va)
Date Posted: 10 Feb 2026 at 9:03pm
| Steve, I think if Todd has the G149 block it won't have the extra port in the side of the block for the pressure line IN from pump/filter |
Posted By: toddhinIN
Date Posted: 11 Feb 2026 at 10:59am
| Thanks Wes, I looked at the block last night and realized exactly what you said. I have the port for the smaller tee that comes from the cam and goes to the rocker shaft and governor but not the one below it on the full flow blocks. Does that lower port go into the center crank bearing or?? I may have answered my question, for the low hours this tractor will be used it probably wouldn't be worth worrying about! Thank you all. |
Posted By: steve(ill)
Date Posted: 11 Feb 2026 at 4:52pm
todd..... it has run with the Bypass for 65 years... probably can make it another 50 !! 
------------- Like them all, but love the "B"s. |
Posted By: AC720Man
Date Posted: 11 Feb 2026 at 8:12pm
|
Just my guess, I’m thinking Wes’s engine is out of an early D15, G149. Has the hole below the T for full flow system tubing. Were they not full flow? Or am I wrong? ------------- 1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD |
Posted By: toddhinIN
Date Posted: 12 Feb 2026 at 10:30am
| Agreed! |
Posted By: Alex09(WI)
Date Posted: 12 Feb 2026 at 5:40pm
|
The block in question (A-C#234353) is the later backwards compatible version that can be set up for both bypass and full flow. Came factory on D15 and late D10/12 tractors and is what you received when ordering a replacement from the dealer. The engine serial # would normally tell you what oil system it is set up for. Since there is no steel ball in the drain back hole, it is set up for bypass. Put the bypass filter and lines on and run it. The full flow blocks have the ball to prevent the oil running past the pushrods to the sump from coming out the hole. ------------- www.awtractor.com A&W TRACTOR 920-598-1287 KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY |