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littlemarv 
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Joined: 10 Jun 2013
Location: Wisconsin
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 Topic: M&W pistons
Posted: 05 Dec 2015 at 7:07am |
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I see people talking about M&W pistons. I see in another thread engines with M&W pistons may have a tendency to crack crankshafts. What are M&W pistons and what does M&W stand for? Thanks in advance.
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The mechanic always wins.
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SHAMELESS
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Joined: 13 Sep 2009
Location: EAST NE
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Posted: 05 Dec 2015 at 7:52am |
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dad had M&W pistons put in an old "M" Farmall back in the 60's, gave that tractor more power! M&W also made lot of add on power steering units for old tractors, and I think it's the same company that made the first big gravity flow wagons? amongst other things. all quality equipment.
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Unit3
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Joined: 17 Oct 2009
Location: NC Iowa
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Posted: 05 Dec 2015 at 8:43am |
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I have them in my 7045ps. It now will start in the dead of winter. I try to plug it in and not use the starting fluid to much. I was told the same thing that it will break the crack shaft some day. Have run them over 15 years now. The 7045 is not a hard use tractor, spraying, mowing fence lines, and snow blowing is all it does. It will be one of the last to leave the farm.
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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
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HudCo
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Joined: 29 Jan 2013
Location: Plymouth Utah
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Posted: 05 Dec 2015 at 10:43am |
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if you go to the wheel wieght section and click on the photo it take you to m&w piston specs. says for 226 cu. 4 1/8 bore 240 cu. 7.3 compression ratio dosnt seem any more than useing a 175 kit so does that create a crank issue also with the 175 parts in a wd45? about what year did 4 1/8 stuff come out because if i remeber right when it took our 45 apart about five years ago it had 4 1/8 in it sure dont remeber it being done so it be done some time in the late sixtys
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Kevin in WA
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Joined: 08 Feb 2010
Location: Lynden, WA
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Posted: 05 Dec 2015 at 11:37am |
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Tim, your 7045 will be fine with M&W's, they are the same exact compression ratio as OEM pistons, they start better because of the headland ring design which seals better at cranking speed. The crankshaft breaking thing with M&W's, has to do with WD 45's only.
I should clarify, the kits for the gas engines were higher compression.
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Bill Deppe/AC Salvag
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Joined: 12 Sep 2009
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Posted: 05 Dec 2015 at 1:43pm |
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Should note, the reason for WD45 cranks having problems is the lack of overlap of the main journals and rod journals, creating a weak point. Compare to the D17 crank, the main journals are larger diameter and thereby lap over the rod pin journal
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randy
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Posted: 05 Dec 2015 at 3:02pm |
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Meiners and Warsaw were the two guys that started M&W. Cant remember there first names, someone from the Gibson City area will know.
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CA WD WD45 D17 D17 Diesel 7060 8050 8070
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MACK
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Posted: 05 Dec 2015 at 10:10pm |
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The reason 45s broke some crank shafts was because the wrist pins were off set which gave them more power and put power to crank at a different angle. MACK
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Kevin in WA
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Posted: 06 Dec 2015 at 12:16am |
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The D17 crank is much heavier in the web between the main and rod journals, they were able to do this because they narrowed up the main journals and increased the diameter to 3 inch.
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