990 Selectomatic

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990rg
Posts: 9
Joined: Sun Sep 18, 2016 4:06 am
Location: Kentucky, USA

990 Selectomatic

Post by 990rg » Mon Oct 09, 2017 12:22 am

Good day all, I am engaged in restoration of a DB990. This tractor has been my uncle's tractor since the mid 1970's. With age (both tractor and man), the 990 fell into disrepair. At the death of my uncle, Rupert Gossett, I obtained the tractor.
To begin with, the fuel tank was rusted beyond repair. The engine was locked and after pulling the head it was obvious that major work was required. I have some pics to post and hope to share this journey and destination with all of the fine DB folks here. Location - Kentucky USA.

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990rg
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Location: Kentucky, USA

Re: 990 Selectomatic

Post by 990rg » Mon Oct 09, 2017 12:50 am

Here are some early pics.

The tractor was kept under a tarp (mostly), so there is some good there. The operator area looks to be in good condition for its age.
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990.jpg
First look
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990a.jpg
First look too
990a.jpg (218.21 KiB) Viewed 5657 times
990b.jpg
hood off, checking status
990b.jpg (222.68 KiB) Viewed 5657 times

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990rg
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Location: Kentucky, USA

Re: 990 Selectomatic

Post by 990rg » Mon Oct 09, 2017 1:16 am

Here is what I found after pulling the head, not good. I can now see why the motor was locked up. :(
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990rg
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Location: Kentucky, USA

Re: 990 Selectomatic

Post by 990rg » Mon Oct 09, 2017 2:03 am

I did get the chance to acquire an original David Brown Technical manual. It contains lots of useful info.
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990rg
Posts: 9
Joined: Sun Sep 18, 2016 4:06 am
Location: Kentucky, USA

Re: 990 Selectomatic

Post by 990rg » Tue Oct 24, 2017 5:29 pm

With new parts installed, plasti-gauge test on rod bearings, even some paint - I re-assembled the engine. After bleeding the fuel system, and cranking the engine over quite a bit, I turned the fuel on, gave a sniff of starting fluid. It started right away, and purred like a kitten. Love the first start after any rebuild, but especially this one. On to the re-assembly of the rest of the tractor. SG :D
Attachments
990eng_comp.jpg
AD4/ 49 coming together
990eng_comp.jpg (62.51 KiB) Viewed 149 times
990eng_comp2.jpg
getting ready
990eng_comp2.jpg (59.62 KiB) Viewed 149 times
990eng_comp3.jpg
990eng_comp3.jpg (61.9 KiB) Viewed 149 times

Walker269
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Re: 990 Selectomatic

Post by Walker269 » Fri Nov 10, 2017 12:58 am

I’m doing a complete rebuild as well on my ad4/47 990 and have had the block dipped. Pulled the wet cylinders but found no cam bearingings in this motor. Is this normal for the 990 tractors. I have never see this before.

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990rg
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Location: Kentucky, USA

Re: 990 Selectomatic

Post by 990rg » Tue Nov 14, 2017 1:51 am

Looking through the service manual, I see nothing about replacing cam bearings. I do see a picture with cam journal specs. I will post the pics here asap.
My 990 has a AD4/ 49.

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990rg
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Location: Kentucky, USA

Re: 990 Selectomatic

Post by 990rg » Tue Nov 14, 2017 10:58 pm

See the attached pics for cam journal specs, and the camshaft rear bearing noted as "G" in lube system pic.
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cam_specs.jpg
cam_specs.jpg (24.45 KiB) Viewed 21 times
lube_system.jpg
lube_system.jpg (26.65 KiB) Viewed 21 times

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990rg
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Location: Kentucky, USA

Re: 990 Selectomatic

Post by 990rg » Fri Nov 17, 2017 2:59 am

Good news! The engine is running perfectly, and has been run in (heated up) enough to set the rings. Bad news! Pulling back in to the shop, feeling just great at the results with the motor, when I pressed the clutch to stop, something popped. What was that and why is the tractor still pulling even though the clutch is pressed? I knew I was not finished turning wrenches (spanners) when I felt the pop. I checked the clutch free travel, even adjusted it trying to achieve positive results. No luck. So... pulling the fuel tank and top clutch inspection cover, I see the problem. One of the finger mechanisms has broken and the pressure plate will need to be replaced. Bring on the tools and let us get started - see pics.
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clutch2.jpg
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clutch1.jpg
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clutch4.jpg
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clutch3.jpg
Broken finger bracket
clutch3.jpg (54 KiB) Viewed 8 times

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990rg
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Location: Kentucky, USA

Re: 990 Selectomatic

Post by 990rg » Fri Nov 17, 2017 3:07 am

I have a mostly complete parts tractor, which includes a complete clutch assembly. However, I was thinking I should replace all clutch parts with new. After checking prices, I find that new pressure plate is around $1000. The used parts are looking better all of a sudden. I will have to make a close inspection and make a decision tomorrow.

Anyone want to share thoughts?

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