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  #1  
Old 10-16-2022, 01:36 AM
wej612 wej612 is offline
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Default Value? Magnum 18 low hours good compression

I am parting out an older snapper mower with a hydro. Has an Magnum 18 in it with 438 hours after I mowed with it a few times I didn't like how it cut and didn't want to put extra time and money into it vs my cub cadets. Motor had plenty of power. Curious what is a fair price for a good example. Still had a little original paint on the mufflers and exhaust. I don't post much at all. Usually just a reader. I am not sure if I can post anything for sale on this forum, but would like opinions on a listing price?

Magnum 18
model no M18QS
Spec no 24521
Serial number 1909407566

Mower Snapper
Model number YT18H484K

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  #2  
Old 10-16-2022, 10:59 AM
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Farmall450 Farmall450 is offline
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$250 tops. Basically what you can buy an entire parts tractor for to take the engine out of.
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Old 10-16-2022, 04:05 PM
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Also the specks of the engine help increase or decrease the value.
Not all M-18's are the same, some have different crankshaft diameters and lengths.
Some have different compression chambers in the heads.

Also, "good compression" is best described with actual numbers.
just like a coat of fresh paint don't make an engine "all overhauled"
hope this helps.
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Old 10-16-2022, 06:10 PM
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The crank snout on the Snapper M18QS is an inch by three inches with 3/8-24 thread. The Cub spec M18S is 2-51/64" X 1-1/8 with 7/16-20 thread.
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Old 10-18-2022, 10:51 PM
wej612 wej612 is offline
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Thank you for all the input.

Didn't know the front crank snout differences. To clarify really good compression was in the 120-130psi on each cylinder. I can hook up a battery and remeasure after the last 6-8 hours of run time, but given the prior owner and I always used some of the best oil and filters we could find (WIX and Full synthetic Mobil1) I suspect it will still be really good still.

As far as the crank snout> could it not be stepped up to 1 1/8 and 13/64 .203125" longer a deal breaker for a conversion? FYI It has a fully functional electronic clutch on the front.. had a nice pull and flip to engage PTO switch. Exhaust on it still has some original looking paint. May list it high on craigslist and ebay. If it doesn't sell then use in a yard truck with a jacobsen GT16 cast iron hydrostat rear with the eaton 11 I think it is. The K341 out of that is a backup for my cub cadets. Would likely just use the electronic clutch on that too if it was a different front crank snout too!? For 200-250 I may keep for some kind of project or repower.
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Old 10-19-2022, 12:04 PM
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Quote:
Originally Posted by wej612 View Post
Thank you for all the input.

Didn't know the front crank snout differences. To clarify really good compression was in the 120-130psi on each cylinder. I can hook up a battery and remeasure after the last 6-8 hours of run time, but given the prior owner and I always used some of the best oil and filters we could find (WIX and Full synthetic Mobil1) I suspect it will still be really good still.

As far as the crank snout> could it not be stepped up to 1 1/8 and 13/64 .203125" longer a deal breaker for a conversion? FYI It has a fully functional electronic clutch on the front.. had a nice pull and flip to engage PTO switch. Exhaust on it still has some original looking paint. May list it high on craigslist and ebay. If it doesn't sell then use in a yard truck with a jacobsen GT16 cast iron hydrostat rear with the eaton 11 I think it is. The K341 out of that is a backup for my cub cadets. Would likely just use the electronic clutch on that too if it was a different front crank snout too!? For 200-250 I may keep for some kind of project or repower.
FWIW: There has never been an "electronic" clutch on those kohlers, it is a normal electro magnetic clutch, just like most air condition pumps on vehicles for 60 years, and most other electric clutches on lawnmowers/garden equipment.

If you are seeing 110/120 pounds of compression, either your gauge is inaccurate or someone put some special heads on it.
Not to be argumentative, but sometimes sellers are a bit optimistic.
Best to be accurate so a savvy buyer is not run off unduly so.
Take off the air cleaner, does it have oil present inside it? is the metal base it sits on wet with oil? if not, that is a good sign.
Note:
it can have a drop of oil on the inside of lid that covers the air cleaner but not dripping with oil.
oil pressure:
cold it can go as high as #80 dropping to and stabilizing around#20/40 when hot after a hard workout.
hope this helps you.
Oh, shipping will be a deterrent due to the weight, but I'm sure you have thought of that
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  #7  
Old 10-20-2022, 01:52 PM
wej612 wej612 is offline
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Thank you again for all the valuable feedback! I appreciate it very much.

By "electronic" clutch- I meant a normal electro magnetic clutch vs pure mechanical clutch like the older cubs I have 149 and 125 Plus snow blower, tiller, wheel weights etc..

I will redo compression and if it is that high I will check for carbon build up in the cylinder. I have not added oil to the cylinders yet for storage so it should not be skewed there. Maybe I am remembering wrong-It was one of the first things I check before loading up the mower a few years ago. For the price I was taking it if the motor was solid. I remember the numbers being very good. I make sure to run everything with an engine several times a year. Just took this one out of rotation lol. Would 100-110 PSI with a spark plug hole screw in compression gauge be a more usual range?

The air cleaner and housing did not have any oil present /noticeable inside it. The metal base it sits on was dry for initial filter replacement with a Kohler filter and recent removal to remove throttle cable/choke cables when I pulled the engine. Glad to hear that is a good sign!

I have not hooked up an oil pressure gauge since I purchased. I don't recall what it was. Good idea. I can clamp down the mounting plate from the snapper which is still attached to run for a bit.

Yes shipping won't be fun, so the list price for ebay would be much higher than craigslist. I don't mind reminders there for sure.

Thank you for the help!
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Old 10-20-2022, 09:52 PM
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Fastenal can ship it. I've paid $75 for an Onan B48G from Michigan to Georgia but then they charged me $150 for another B48G from Illinois to Georgia. Get a quote from them it may not be too bad.
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Old 10-29-2022, 09:43 PM
wej612 wej612 is offline
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Another good tip- Thank you. I would not have though to get a shipping quote from Fastenal! Frankly, I did not know they did that.
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