D17 engine- what most likely broke?
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=190188
Printed Date: 24 Jun 2025 at 7:37pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D17 engine- what most likely broke?
Posted By: Foreign.Perspective
Subject: D17 engine- what most likely broke?
Date Posted: 20 Aug 2022 at 7:57am
|
Have a D17-IV, Gas. Was mowing pasture a couple of days ago and all running fine. When I stopped for the day, after Ole long to cool down, I turned the key off ant the engine backfired and made a huge clanging knock in the engine. Yesterday when I went to start it, it spun over like there was no compression, backfired occasionally and would not start. The front crankshaft pulley and the distributor are turning. Any idea where to start looking? Any help would be appreciated. Thanks!! |
Replies:
Posted By: DrAllis
Date Posted: 20 Aug 2022 at 8:34am
| A good place to start would be remove all the spark plugs, pull the throttle wide open, connect a battery charger and run a cranking compression test. |
Posted By: Les Kerf
Date Posted: 20 Aug 2022 at 8:56am
I would be inclined to pull the spark plugs and then try turning the engine over by hand to feel for any abnormalities, then run the compression test as mentioned above. Good luck! |
Foreign.Perspective wrote:Posted By: DanWi
Date Posted: 20 Aug 2022 at 9:06am
|
Not sure how that motor is but might guess a broken cam or gears. |
Posted By: Clay
Date Posted: 20 Aug 2022 at 9:21am
|
Sounds like a possibly bad valve. Pull all spark plugs and check their condition. Check for compression. Sometimes a valve stem may carbon up and keep a valve from closing fully. This may cause the engine to fire improperly. You may want to remove the valve cover and inspect and adjust the valve train. I was swathing with a New Holland 1114 diesel swather and lost a piece of a valve. It was running fine until I shut it off. After lunch, I started the engine and noticed a slight tapping sound. A piece of the valve broke off and embedded into the top of the piston. Fortunately, it did not score the cylinder or damage the head. Replaced all valves and had the head serviced by a machine shop. Piston, gaskets, valves, misc. parts and machine work was $736.
|
Posted By: Foreign.Perspective
Date Posted: 20 Aug 2022 at 11:18pm
|
Well, I finally got off work and did a compression test on the engine. I pulled the plugs and all 4 looked good, with no major difference between them. All 4 cylinders were between 180 & 195 psi on the compression test, So, all valves and pistons are ok. I’m guessing the most likely next step is to check the camshaft gears to see if it broke some teeth and the cam is out of time with the crank. Does that sound logical? Can I access the cam& crank gears in-frame or will I have to split and remove the front bolster or the entire engine? I appreciate all the replies and ideas. Thanks!! |
Posted By: JPG AUSTRALIA
Date Posted: 21 Aug 2022 at 12:42am
| I would think if your compression is good the cam would be fine, |
Posted By: DiyDave
Date Posted: 21 Aug 2022 at 4:35am
Check the timing. Could be the dizzy drive gear has shifted/broken pin... ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
Posted By: nella(Pa)
Date Posted: 21 Aug 2022 at 5:40am
X 2 I have herd of governor weights breaking if you herd a cracking noise!
|
Posted By: WF owner
Date Posted: 21 Aug 2022 at 6:48am
| Next I would remove the distributor cap and see if it is turning (smoothly) when the engine is turned over. Put the rotor back on and see if it turns while holding it. |
Posted By: IBWD MIke
Date Posted: 21 Aug 2022 at 7:28am
|
All 4 cylinders were between 180 & 195 psi on the compression test, It would be interesting to know what pistons and sleeves it has in it. Pretty high compression numbers. Not a bad thing, just a curiosity.
|
Posted By: MACK
Date Posted: 21 Aug 2022 at 7:51am
| Sounds more like a timing problem. Roter broke, gear on bottom of distributor, or governor gear. MACK |
Posted By: DrAllis
Date Posted: 21 Aug 2022 at 6:16pm
| Your compression is good enough to run, but your tester must be incorrect. Any D-17 gas with stock pistons and sleeves should be 145 psi. A 170 or 175 would be 170 to 175 psi. Your numbers are beyond any AC spec. |
Posted By: Ryan Renko
Date Posted: 21 Aug 2022 at 7:12pm
|
Posted By: aclongb56
Date Posted: 21 Aug 2022 at 7:40pm
|
Check the point's, and disturber cap, and rotor.. Gas also we run rec gas in all of ours, lot more $ Now days When carb starts frosting up,, looks like white frost.... 90 octane or btr. ------------- 25-40,A,U,UC,Styled,unstyl,WF'S,WC'S,WC ROAD PATROL,WD'S WD45,RC,IB,3 Waukesha B,B'S C,CA'S,G'S,D12,D15,D17,B-10 thru 919 L&G.... Father's and Boy's and Toy's... Just don't let MOM know!! |
Posted By: corbinstein
Date Posted: 22 Aug 2022 at 6:27am
| I'm with the rest of the boys. Cam probably ok. check your dizzy drive. |
Posted By: SteveM C/IL
Date Posted: 23 Aug 2022 at 9:40am
| Be interesting to see the final outcome. |
Posted By: Alex09(WI)
Date Posted: 23 Aug 2022 at 5:17pm
|
check to see if rotor is going around when cranking and remove distributor from horizontal drive to check for worn teeth on dist. drive gears ------------- www.awtractor.com A&W TRACTOR 920-598-1287 KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY |