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D17 engine- what most likely broke?
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Foreign.Perspective View Drop Down
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Joined: 22 May 2017
Location: Texas
Points: 71 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Foreign.Perspective Quote  Post ReplyReply Direct Link To This Post Topic: D17 engine- what most likely broke?
    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!!
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22136 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post 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.
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Les Kerf View Drop Down
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Joined: 08 May 2020
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Points: 1377 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 20 Aug 2022 at 8:56am
Originally posted by Foreign.Perspective Foreign.Perspective wrote:

... the engine backfired and made a huge clanging knock in the engine...


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!
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DanWi View Drop Down
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Joined: 18 Sep 2009
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Points: 1941 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DanWi Quote  Post ReplyReply Direct Link To This Post Posted: 20 Aug 2022 at 9:06am
Not sure how that motor is but might guess a broken cam or gears.
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Clay View Drop Down
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Joined: 11 Sep 2009
Location: Udall, Kansas
Points: 9992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Clay Quote  Post ReplyReply Direct Link To This Post 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.  
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Foreign.Perspective View Drop Down
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Joined: 22 May 2017
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Points: 71 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Foreign.Perspective Quote  Post ReplyReply Direct Link To This Post 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!!
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JPG AUSTRALIA View Drop Down
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Joined: 13 Sep 2009
Points: 767 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JPG AUSTRALIA Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 2022 at 12:42am
I would think if your compression is good the cam would be fine,
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DiyDave View Drop Down
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Joined: 11 Sep 2009
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Points: 54397 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 2022 at 4:35am
Check the timing.  Could be the dizzy drive gear has shifted/broken pin...Wink
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nella(Pa) View Drop Down
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Joined: 11 Sep 2009
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Points: 3133 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nella(Pa) Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 2022 at 5:40am
Originally posted by JPG AUSTRALIA JPG AUSTRALIA wrote:

I would think if your compression is good the cam would be fine,

X 2
I have herd of governor weights breaking if you herd a cracking noise!


Edited by nella(Pa) - 21 Aug 2022 at 6:04am
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WF owner View Drop Down
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Points: 5052 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WF owner Quote  Post ReplyReply Direct Link To This Post 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.
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IBWD MIke View Drop Down
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Points: 4130 		Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post 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.
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 2022 at 7:51am
Sounds more like a timing problem. Roter broke, gear on bottom of distributor, or governor gear.                    MACK
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22136 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post 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.
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Ryan Renko View Drop Down
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Joined: 12 Sep 2009
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Points: 2336 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan Renko Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 2022 at 7:12pm
Originally posted by DrAllis DrAllis wrote:

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.
I was thinking the same thing. When I checked mine a few months ago each cylinder was 145 on the nose!! I was happy with the results. Ryan
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Joined: 07 Sep 2021
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote aclongb56 Quote  Post ReplyReply Direct Link To This Post 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!!
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corbinstein View Drop Down
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Points: 796 		Post Options Post Options   Thanks (0) Thanks(0)   Quote corbinstein Quote  Post ReplyReply Direct Link To This Post Posted: 22 Aug 2022 at 6:27am
I'm with the rest of the boys. Cam probably ok. check your dizzy drive. 
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8676 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2022 at 9:40am
Be interesting to see the final outcome.
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Alex09(WI) View Drop Down
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Joined: 15 Mar 2012
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Points: 1759 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Alex09(WI) Quote  Post ReplyReply Direct Link To This Post 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
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