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Farmall & IHC Tractors Discussion Forum
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need more horsepower in a 674

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Ian Davies

12-09-2004 16:12:19




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We have an international 674 I was just wondering the best way to increase horse power/torque The engine looks to be burning oil so probably needs to pistons, rings and sleeves, maybe there are higher compression pistons or can you stroke it without major modifications ie needing new oil pan? also the airfilter has no prefilter so am looking at puting on a donaldson prefilter which should also shorten the present restrictice air inlet above the radiater which also gos across a hot engine
I know I could go to a turbo or changing tractors but just want to keep it cost effective. Also the slightly larger 684 tractor has more horses than this one I dont know how they did it for it probably tweeked the injector pumpthis would give more horsepower but not necessarily more torque ie it would just rev more

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El Toro

12-10-2004 09:33:13




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 Re: need more horsepower in a 674 in reply to Ian Davies, 12-09-2004 16:12:19  
If you have enough power to create wheel slippage
you have enough power. The wheels will just spin faster. Hal



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Novel Idea Guy

12-09-2004 18:36:46




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 Re: need more horsepower in a 674 in reply to Ian Davies, 12-09-2004 16:12:19  
This is a tractor from the '60s, not the '40s. In the '60s, when you needed more horsepower, you bought a bigger tractor. You're not going to find hop-up parts like you would for the old Farmall Hs and Ms.

Engine technology and cost-cutting caught up with packaging. Tractors were no longer tremendously overbuilt for the power they produced. In fact, you were lucky if the drivetrain could handle the power from the stock engine!

It's probably down on power due to the engine problems. Get those fixed and it will have better power. If that still isn't enough, then you need a bigger tractor.

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JB2

12-09-2004 18:21:40




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 Re: need more horsepower in a 674 in reply to Ian Davies, 12-09-2004 16:12:19  
Hi, search the archives under 674 or 684 and you will find the instructions to turn up the injector pump.

But if it is smoking and burning oil I would suspect you have a broken piston ring. These German Diesel engines normally don't burn oil but on occassion a piston ring will break. If it is just Diesel smoke is the injector pump timing correct ?

Good luck
JB2



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Ian Davies

12-09-2004 19:02:53




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 Re: need more horsepower in a 674 in reply to JB2, 12-09-2004 18:21:40  
it only smokes a little blue smokeI guess i am using the wrong term sying it burns oil , after a tank of diesel I look at the dipstick and there is no oil on it after previously being filled. it seems to be developing good power though but i need more without having to buy a biger tractor



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Glenn F.

12-09-2004 20:00:09




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 Re: need more horsepower in a 674 in reply to Ian Davies, 12-09-2004 19:02:53  
How many horsepower is that tractor? Glenn



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ian davies

12-09-2004 22:01:16




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 Re: need more horsepower in a 674 in reply to Glenn F., 12-09-2004 20:00:09  
Some say 80 horsepower some say 68 horse power at the flywheel and around 58 pto horse power. It is more pto horsepower i need for silerating.



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