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MF-135 Changing spark plugs? Doesn't look easy.

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08-31-2004 19:38:00

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I am a new owner of a "74 MF 135 with a Perkins 3 cylinder gas engine. I want to change spark plugs, etc., My question is whether I need to take off the gas tank to gain access or any other suggestions on this? Thanks for advice.

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Fred Mills

09-01-2004 13:30:46

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 Re: MF-135 Changing spark plugs? Doesn't look easy in reply to greenengr, 08-31-2004 19:38:00  
You can change the plugs if you remove the heat shield.

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09-01-2004 05:52:06

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 Re: MF-135 Changing spark plugs? Doesn't look easy in reply to greenengr, 08-31-2004 19:38:00  
Beins youuns an engr, get a replacement plug in preferably Platinum and ya won't be doin this again. One of the plug mfgr's probably has a cross ref. (I am too so I have the right to a lil fun.)

I like to run solid state ignition from Genessee and deep shank plugs like you find in current production auto's in my Fords that are/were gassers. (My Perkins 3/152 is Diesel so I don't know how Perkins gassers are set up.) I usually play around with some used ones (plugs) from autos that I kept in the shop and once I find a geometry and heat range that lets me idle without missing (at all) I go and buy a new set for the tractor.

If you do go to one with a long snoz, be sure and do an interference check with the piston first. I run the piston to TDC and measure the distance from the head so I don't run the risk of punching a hole in the piston. So far haven't had a problem.

I just think, no I know, a spark that sits in the combustion chamber is more effective than the OEM surface mount that essentially had the spark in the head.

My MF 35 has a lift up hood (from the rear). Makes things easier. Don't know if the 135 does also or not.

Good running.


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08-31-2004 20:51:32

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 Re: MF-135 Changing spark plugs? Doesn't look easy in reply to greenengr, 08-31-2004 19:38:00  
I have an MF20 with a loader(3 cyl Perkins gas engine). I unbolt the gas tank at the rear and lift it up to change the plugs. I do not disconnect any fuel lines. I do wait until the gas tank is near empty and therefore lighter.

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