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Minneapolis Moline Tractors Discussion Forum
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Increasing the compression of a 705

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Bill from Scotl

03-22-2008 06:19:58




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Hi Guys
Has anyone fitted thinner head gaskets to increase compression as an aid to starting from cold? Seems to me these engine become difficult to start when they get a little tired but fine once hot.I understand these were designed with low compression engine from new. Anybody got any thoughts on this? I thought about making thin gaskets out of copper sheet and sealing them down with silicone gasket solution. I know the real answer is to spent lots of money and re-build the engine but thought this might work as this tractor will only be used for shows and never worked hard.
Thanks
Bill

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64504

03-22-2008 15:48:32




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 Re: Increasing the compression of a 705 in reply to Bill from Scotland, 03-22-2008 06:19:58  
I know it is hard for most people who own farm equipment because there are not that many farms as there use to be. One of the reasons why these engines are hard to start is a number of people use either to assist starting. this increases engine wear really fast. Another thing that wears engines down is people letting the tractor idle or under worked.

A really easy way to fix your cold start problem is to put in a coolent heater. as you said the tractor won't be used for much so it would save the effort of taking the engine appart if nothing else is wrong with it.

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Chuck S.

03-22-2008 14:59:11




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 Re: Increasing the compression of a 705 in reply to Bill from Scotland, 03-22-2008 06:19:58  
Dsl. or Lp? Dsl. check injector popoff pressure set app 200psi over spec.Check spray pattern and clean energy cells. To up compression remove gaskets from under blocks.



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marco340

03-22-2008 13:12:47




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 Re: Increasing the compression of a 705 in reply to Bill from Scotland, 03-22-2008 06:19:58  
yes a thinner head gasket is an old racing trick to raise the comp. ratio a little. how thick is the stock or available replacement gaskets ?typical is from .030" - .055" measure what you have with a caliper or micrometer. shop around , brand a might be .053" and brand b .030" racers have used soft copper head gaskets for years and also embossed steel shim gaskets, as thin as .015", with silicone around the water holes or better yet spray entire gasket both sides with coppercoat from permatex or silver or copper spray paint. NOTE- race engines have freshly surfaced blocks and heads-clean and straight keeps it sealed-just have your head surface cut .020"-.030" it may not be much, but it is noticable and worth doing on a well maintained and tuned engine.

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Molineone

03-22-2008 06:26:27




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 Re: Increasing the compression of a 705 in reply to Bill from Scotland, 03-22-2008 06:19:58  
I don't think the "thick" gaskets are the reason for the low compression. Shaving a little off the gasket would not change the ci much. Someone else may think differently, I will be watching for entertainment purposes only. Good luck of you attempt the copper/silicone gasket approach. I personally would not try it.



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Jake Winn

03-22-2008 17:26:09




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 Re: Increasing the compression of a 705 in reply to Molineone, 03-22-2008 06:26:27  
One thing i found really helpful on the 97 Massey (g705) that I had was good batteries, cables and good starter. If it cranked slow it wasnt going to start. If it cranked over fast, it would fire off good. I had the fuel system rebuilt and it had about 6000 hours and had never been apart. One of the best running MM diesels i had ever seen. One other thing i did to help it start was to put a intake air heater in the front plug on the intake manifold. I used a 2nd starter relay to activate it. On a cold morning i would hold it on for about 30 seconds, crank it for a few, then hold it for about a minute. It made a bit of difference. Enough i thought to recommend it to others. Just dont use it in conjunction with starting fluid

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