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#1
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Low hr M20 issue
After "swapping" this low hr M20 in my 1872 (Now 2072), I found out really quick, it's not going be a turn key swap. The carburetor got issues, some sludge where hiding behind those shield but no oil leak from both crank oil seal and head gasket. I clean the engine put it back together and in the 1972 he goes.
I decided to do some tuning and testing, I manage to make it run smoother but the carb still need to be restore. no big deal since the M18 got one running well I swap that later if need. Things get wear when I did a compression test here the result after 10 minutes warm up. First test cylinder one 105psi First test cylinder two 75psi I warm up the engine again and give it another try: Second test cylinder one 95psi (sorry this one is out of focus) Second test cylinder two 89psi I think it's a bit low for a 200hr engine, I suspect a valves leak so as soon I found out how to find the dead center position on this engine I will do a leak test. If my suspicion are right I need to remove that engine from the cub and open it, This need to wait a bit... story to followed soon...
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Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap) |
#2
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Head gaskets are another good thing to check, if the engine has a blown gasket it can cause bad readings on a compression test. Just something else to check out.
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-Ryan
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#3
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Good thinking Ryan! Having variable result like that make me think "Sticky valves", since that engine was sitting in a corner for few years it make sense but I'm not ready to remove the engine from that cub, my expensive Canadian made cherry picker hydraulic cylinder crap out! Kapout! I will pick a cheap Harbor freight air/hydraulic Friday ($72 with a 20% coupon), no way I spend $500 on a new OEM cylinder or lost my time rebuilding the old one .....To be continue
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Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap) |
#4
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Quote:
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-Ryan
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#5
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ol Skull,
Been my findings that the M-18's run in the #90 range. I have 4 engines that reflect that. One engine has new .010 overbore, pistons & rings and about 50 hrs running time and both cyl read #92 The M-20 is stroked a bit, so it could run higher, they say + or - 10% and with carb butterfly wide open You can check valve clearance, but I say run it a bit and get a "feel" for it. |
#6
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Quote:
http://www.onlycubcadets.net/forum/s...ghlight=Magnum Now you tell me you got four M-18 in the 90psi and among them one partially rebuild with 50hr on the counter! G...I think I have a brain fart.....Cricket.....cricket
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Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap) |
#7
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Quote:
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2072 w/60" Haban 982 with 3 pt and 60" Haban 1811 with ags and 50C 124 w/hydraulic lift 782 w/mounted sprayer 2284 w/54" mowing deck |
#8
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Quote:
Edit: Found it; if the difference between cylinders is greater than 15% or the pressure is less than 90psi, service is basically required.
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-Ryan
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#9
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I'd run it a while and see if it comes out of it. Make sure it's tuned up right, fuel system clean.... then run it. Work it hard. It may just surprise you.
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#10
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Ryan is right about the manual saying 15% or under 90 psi engine need services, that why George statement surprise me a bit but he is not a young spring chicken and have done a few before and even if his tools are old as he is, they are like him build from a era of quality and perfection...( I'm such a..hole licker, you can pay me later George)
Joke aside I really don't know what to think, for me 90psi is way lower then anything I work on before, these are very low compression engine so I walk in darkness territory here and I try to avoid stumbling on the carpet flowers... For now my cranium Hamster need to be feed before he spin the wheel on high gear so i'll be back in a jiffy!
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Gilles. 1988 2072 401 54" hyd angled blade 1988 1872 364 snowblower/C50 deck 1976 1650/QA42A blower/44A deck/standby 1976 1450TS/Sleeve hitch/44A deck/in storage 1963 100 (red)/in storage 2010 Kubota 2380-2/42" infinity deck (engine swap) |
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