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Restoration & Repair Tips Board

Increasing compression

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Bill from Scotl

03-22-2008 06:22:12




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Hi Guys
Has anyone fitted thinner head gaskets to increase compression as an aid to starting from cold? The tractor is a MM 705. 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 Thanks
Bill

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Jon Hagen

03-22-2008 09:03:42




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 Re: Increasing compression in reply to Bill from Scotland, 03-22-2008 06:22:12  
You need to take care with valve to piston and head to piston space with a diesel when considering thin gaskets.
My experience with those low compression engines is that when the air temp is below 50 F, you give them just a sniff of starting fluid to help them light off without the detonation rattle of too much start fluid.



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B-maniac

03-23-2008 19:17:31




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 Re: Increasing compression in reply to Jon Hagen, 03-22-2008 09:03:42  
What Jon said. In my opinion a hard starting (in cold) diesel is a product of slow starting system and/or worn or dirty injectors that don't atomize the fuel like they should. Usually both. A gas engine will start even if it rolls over slowly as long as it will fire a few times it will take off. A diesel has to turn over pretty fast especially in cold weather.Especially a diesel with worn rings. May sound like it is but sounds can be decieving on a diesel. Put a GOOD charger on it for an hour and see what it does. If it starts ok then you can save your time and money on "raising" compression and put it into the starting/charging system. Before spending any money you might experiment with fuel blending a little to get a lighter blend that will ignite a little easier in the cold than straight #2 diesel.

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