How do I screw the injector pump in my 1490

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Johncronin
Posts: 3
Joined: Sat Apr 25, 2020 12:31 pm
Location: Kerry

How do I screw the injector pump in my 1490

Post by Johncronin » Fri May 15, 2020 10:10 pm

I have a David brown 1490 with a hefty straight pipe (and a dump valve is being looked about) but she's lacking power and the smoke out of her for tractor runs isn't great like to get a few people looking at her so like I was just looking to see if anyone here knows how to open up the injector pump a lil and if anyone has anything about the dump valve on the 1490 that'd be appreciated thanks

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ollek
Posts: 4073
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: How do I screw the injector pump in my 1490

Post by ollek » Sat May 16, 2020 5:45 am

The 1490 engine shall not smoke when the engine is pulling. Only a slight fume shall be visable. Starting to increase the fueling above the factory setting is definetely not to recommend and correct settings can be made only by a diesel work shop on a pump that has been removed from the tractor. How do you know the tractor is lacking power, or is it just that you want to see smoke from the exhaust?. Please keep in mind that a turbo charged engine shall not smoke and the 1490 is giving its 83 hp without any smoke. The following is a link to the parts calaogue, showing the dump valve, https://partstore.caseih.com/us/parts-s ... 9ar1303707 A dump valve seal kit can be obtained from the following company http://www.davidbrownparts.com/Hydraulic%20System.html

SteveCollett
Posts: 611
Joined: Wed Sep 24, 2008 8:17 am
Location: Suffolk

Re: How do I screw the injector pump in my 1490

Post by SteveCollett » Sat May 16, 2020 9:48 am

I would put my money that this tractor has got glazed bores from not having done enough hard work, a very common problem on this model in particular.
Curing it is very difficult.
The proper cure is head off and using a special tool in the bores to deglaze them ( is it called peening? ). I have never done it so cannot moment on the success rate.
some claim using a running in oil will cure it, but I never had any success.
If she is smoking turning the pump up is the last thing to do
it may be she just needs a decoke.

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ollek
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Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: How do I screw the injector pump in my 1490

Post by ollek » Sat May 16, 2020 11:48 am

Hard work cures the glazed cylinder bores in 90 persent of the cases. Deglazing the bores with the pistons out is called hooning and is needed only if lots of oil is getting into the exhaust side of the turbocharger. The OP says that the engine is not smoking and that is what you will find with a 1490 in good condition. I have a feeling that the OP wants to show others that he has someting special, a powerful and smoking tractor, even thou the text is difficult to understand. But you do not need smoke to get power. Ower fueling a engine can not be recommended in any situations and can lead to problems with the cylinder gasket, piston rings and exhaust valves.

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cobbadog
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Joined: Tue Oct 11, 2011 6:18 am
Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: How do I screw the injector pump in my 1490

Post by cobbadog » Sat May 16, 2020 1:29 pm

Here in Oz, the proceedure for deglazing is called 'honing' and 'peening' is a proceedure done when welding cast iron by using a pick hammer or your chipping hammer and while hot hit the weld while it is hot.
The need for black smoke may have come from watching a show called Welderup where they fit oversized diesel engines into hot rods and they bellow out so much black its just not funny nor useful or generate any extra hp jsut choking the world.

Johncronin
Posts: 3
Joined: Sat Apr 25, 2020 12:31 pm
Location: Kerry

Re: How do I screw the injector pump in my 1490

Post by Johncronin » Sat May 16, 2020 2:14 pm

I know it's lacking power beacuse when we got her she was able to pull 12 silage bales on a trailer no problem or it was able to pull a 10 ton kane trailer easy aswell but the last 2 years it's started to struggle pulling

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ollek
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Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: How do I screw the injector pump in my 1490

Post by ollek » Sat May 16, 2020 2:54 pm

The pump fuel settings will not change ower the years, but many other things can lead to power loss. Have you had the injectors checked by a specialist? Have you adjusted the valves? Have you change the engine air fiters? Have you checked that the full trottle revs with no load on the engine are correct? Have you change the fuel filters and cleaned the screen in the lift pump? Have you checked that there is no dirt in the fuel tanks? Have you checked the compression pressure in all cylinders? Is there oil in the exhaust manifold?

Johncronin
Posts: 3
Joined: Sat Apr 25, 2020 12:31 pm
Location: Kerry

Re: How do I screw the injector pump in my 1490

Post by Johncronin » Sun May 17, 2020 2:34 pm

Yeah im just after finding a big amount of oil all around the turbo and the manifold so that could be our problem there

jazo
Posts: 799
Joined: Fri Jun 15, 2007 7:13 am
Location: New Zealand

Re: How do I screw the injector pump in my 1490

Post by jazo » Tue May 19, 2020 1:28 am

Hi, testing the boost pressure would help diagnosing too, should be around 10psi at full load
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