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Thread: Monty's 1978 Case 446

  1. #1
    It's all about the Benjamin! monterey1962's Avatar
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    Default Monty's 1978 Case 446

    I bought this tractor last year. It had a bad engine knock, and I was dumb enough to buy it for $1,100 (came with a front blade). That price with a bad engine was a rip off. Tore the engine down to find that the rear main bearing was wiped out, and the oil pump had self destructed. Doing a full rebuild, and I'm $300 deep in parts. Spent yesterday and this afternoon cleaning everything and honing the cylinders (pic below). A flex hone and diesel fuel worked pretty good. If I can actually get this thing to run good, I'm either going to build a loader for it, or buy a Johnny Bucket.
    Attached Thumbnails Attached Thumbnails c07.jpg   c06.jpg   c05.jpg   c04.jpg   c03.jpg  

    c02.jpg   c01.jpg  

  2. #2
    I'm an air-conditioned gypsy gadget73's Avatar
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    was thinking that looked like an Onan, then I saw the label. Onan uses a very similar motor on generators, exists in air and water cooled versions.

    wonder if someone ran it out of oil or just let it get nasty until the pump gave out. These things are usually pretty reliable.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  3. #3
    It's all about the Benjamin! monterey1962's Avatar
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    It is an Onan B43G. Oil pump gears were in pieces and the housing was cracked. I'll have to remember to get pics of the damage. Story I got was that the guy was blowing snow and the motor started knocking. Someone had put an electric fuel pump on this tractor, too. I plan to go back to a manual pump.

    Did some assembly. Installed crank shaft, cam shaft, pistons, and valves. I'm not too confident on the rear journal of the crank shaft. There was some damage from the bearing failure that I tried to clean up.

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    GMN Regular DerekTheGreat's Avatar
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    You a fan of mustie1 on YouTube? He has a lot of tractor teardown & "will it run?" type stuff. This would have been a cool teardown to watch.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

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    It's all about the Benjamin! monterey1962's Avatar
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    I'll have to check out that channel.

    Did more assembly, tonight. The "new" used oil pump did not want to fit, so I ended up filing off some extra material from the housing where it was molded. Had a lot of extra material there, and needed a sharp corner rounded off. There are signs that someone has been in this engine before: The old oil pump has grinder marks on the top side where the housing cracked, and the two bolts that mounted the pump were not factory bolts. Installed heads, oil pump, oil pan, flywheel, and some little stuff.

    Sorry for the lack of pics, but I don't really like to stop and shoot every little thing. I like to get a pace going and keep on it.

    Pics of the rear main bearing and old pump below.
    Attached Thumbnails Attached Thumbnails c08.jpg   c09.jpg   c10.jpg  
    Last edited by monterey1962; 08-24-2021 at 12:48 AM.

  6. #6
    I'm an air-conditioned gypsy gadget73's Avatar
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    am I looking at teeth that should be on a gear and a cracked housing? how does that even happen?

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  7. #7
    GMN Regular DerekTheGreat's Avatar
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    That's my problem with pics and video. Ash and I were going to try and start a YouTube channel with that van we bought. Then we forgot to film a lot of it so we were like, F it.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

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    I'm an air-conditioned gypsy gadget73's Avatar
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    I suck at that too. The people that are successful at it put a lot of time and work into it. I can appreciate it, but I can't be bothered to commit to that much effort. Especially with the ad revenue how it is, there is such an amount of work that has to be done before there is even a chance of making any money and unless you're at it constantly and/or get really lucky its basically a lot of work for nothing. I have a channel purely for convenience reasons, its all zero effort "this is how to do a thing" type stuff that a half dozen people watch but its handy as a place to dump that sort of content.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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    Beater gonna beat sly's Avatar
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    I made $142 over 10 years before Google cut off the adsense tit for those with less than 4000 subs.

    Yeah... I didn't spend it all in one place.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
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    Overhead, some poor bastards are flying in airplanes.

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    It's all about the Benjamin! monterey1962's Avatar
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    Pulled the flywheel and timing cover back off, tonight. I had a bad feeling about a steel ball I had seen in the block that didn't match up with my engine manual.

    Picture of block with oil passages: The ball was jammed into the center oil passage hole. I removed the oil pressure bolt, spring, and valve, but couldn't push the ball out from the back side. It was really jammed in there. I took a chance and used a hammer and punch to knock it in, hoping I could dump it out with the engine upside down. It jammed on the other side of the oil passage. Gave it a couple more hits and "plink" into the oil pan it went. *WHEW* Had to pull the oil pan off, but I got it out.

    Picture of timing cover: That ball is actually the ball bearing for the governor shaft. It sits in a hole perfectly where the arrow is pointing. Why ... the ... hell ... was it jammed into an oil passage in the block?!

    Picture of mystery pin: No idea where this thing goes. I thought it came out of the timing cover during disassembly, but there's nowhere for it to fit.

    Picture of old oil pump to show grinding marks and more gear remnants.
    Attached Thumbnails Attached Thumbnails c11.jpg   c12.jpg   c13.jpg   c14.jpg  
    Last edited by monterey1962; 08-24-2021 at 11:07 PM.

  11. #11
    Wagon Addicted Tiggie's Avatar
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    Engine tear down after a failure is very interesting. Good job so far. Do you have a good service manual to help you out on the mystery pin and reassembly?
    1990 Country Squire - weekend cruiser, next project
    1988 Crown Vic LTD Wagon - waiting in the wings

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  12. #12
    I'm an air-conditioned gypsy gadget73's Avatar
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    wonder if someone was in this previously and thought that since the ball could fit in that hole, thats where it went. Assuming the governor didn't work with missing parts either. Grinding marks on that pump look more like angle grinder, not internal self-destruction sort of grinding.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  13. #13
    It's all about the Benjamin! monterey1962's Avatar
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    Quote Originally Posted by Tiggie View Post
    Do you have a good service manual to help you out on the mystery pin and reassembly?
    I purchased a reprint of the original Onan B43G manual. I also have a copy of the Parts manual and Operators manual for the engine and tractor.

  14. #14
    It's all about the Benjamin! monterey1962's Avatar
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    Quote Originally Posted by gadget73 View Post
    Assuming the governor didn't work with missing parts either.
    Governor rotated before, but now it rotates much smoother with the ball in there.

  15. #15
    It's all about the Benjamin! monterey1962's Avatar
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    I've come to the conclusion that the mystery pin does not belong to this engine. Doesn't fit anywhere, and not in the parts manual, as far as I can see.

  16. #16
    Wagon Addicted Tiggie's Avatar
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    Quote Originally Posted by monterey1962 View Post
    I've come to the conclusion that the mystery pin does not belong to this engine. Doesn't fit anywhere, and not in the parts manual, as far as I can see.
    Scary. Whoever was there before hopefully didn't ruin it from being revived.
    1990 Country Squire - weekend cruiser, next project
    1988 Crown Vic LTD Wagon - waiting in the wings

    GMN Box Panther History
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  17. #17
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    That is a cool tractor
    ..

  18. #18
    P31 Pursuit Car Brown_Muscle's Avatar
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    This is a fun/neat project. Looking forward to seeing more of your progress with it!
    -Phil



    +1982 Ford LTD-S Police Car. Built 351w, Trickflow 11R 190 Heads, Edelbrock 1906 Carb+ RPM Intake, WR-AOD, Full exhaust headers to tails. 3.27 Trac-Lok Rear. Aluminum Police Driveshaft. Speedway Springs+Bilstein Shocks, Intermediate Brakes, HPP Steering Box.

    +2003 Acura CL Type S 6-speed

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    Member of the Orb Alliance packman's Avatar
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    Nice! At first glance, I was thinking Explorer 5.0 swap LOL

    Or maybe not LOL

  20. #20
    It's all about the Benjamin! monterey1962's Avatar
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    V8 swap you say? Hmm.

    I pulled the rear main bearing cover off because I was concerned about the crankshaft journal that I had cleaned up. I don't know what to do with it, other than run it and see what happens. They sell downsized bearings, but I didn't really feel like messing with taking it to a machine shop. Hoping this doesn't bite me in the ass. Rear bearing has a few scuffs on it from when I originally test fit it before cleaning up the crank.

    I was going to rebuild the carb tonight, but upon disassembly, I found what looked to be a recently rebuilt carb. Gaskets looked good and were not brittle. Everything is clean. I reassembled it, and plan to run it as is.

    The mechanical fuel pump was bypassed by a previous owner. This tractor has an electric fuel pump mounted under the tractor, and a mess of wiring to go along with it. I have no idea how this mechanical pump works. Need to do some research on hooking things up.

    Edit: This is a pretty good video on this carb. https://youtu.be/yaoJHdrl3kQ
    Attached Thumbnails Attached Thumbnails c15.jpg   c16.jpg   c17.jpg   c18.jpg   c19.jpg  

    c20.jpg   c21.jpg  
    Last edited by monterey1962; 08-26-2021 at 11:38 PM.

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