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1967 SW48 We blew the motor ??

A

alongstreet

New member
Flathead 6 Chrysler, compression is 118psi on 5 cyl, 78psi on 1 cyl, motor runs with half choke and TONS of blue smoke, no power, we were plowing snow like you wouldn't believe, parked it, next day would not run.

Do we rebuild the engine, replace, what about a 251 non industrial substitute ? Any ideas appreciated.

How difficult is it to pull the engine ?

Thanks
Andrew
 
should be no problem to swap ypur governer over to any of the dodge flat heads and if you can come up with a m37 engine it al ready will have a governer a lot of old fork lifts also used those motors so check out fork lift grave yards as a final thaught i under stand that a 225 slant six wil bolt up to that bell housing in my mind that was one of the best built motors ever.
 
Thanks very much Don, we will begin looking for a replacement engine.
Have you ever pulled a motor out of one of these machines ?
We desperately need our snowplow back.

Thanks
Andrew
 
not one of those but lots of vintage power wagons and i would look closely if you want to do the 225 conversion i was only told the bell housing was the same about weather that was accurate or not i don't know and than what kind of room do you have in your engine bay things to think about
 
If it's the same as the J5 (I suspect it is) You'll have to disconnect the throttle, wiring, rad, etc. Should be 4 bolts (2 on front engine mount, and 2 on bellhousing mounts (under seat). Disconnect prop shaft and lift it all out.

Almost like it was built to come out :whistling:
 
Before you junk the motor, make sure the center intake port has not separated from the rest of the manifold. Hard to see if you are not looking for it. Makes for a large vacuum leak, which will require a lot of choke, and even then it will run poorly.

I posted a few photos of my broken manifold about a month ago.

As Aulen said, piece of cake, though mine had a long threaded rod connecting the rear cross brace in the tub to the back of the bellhousing.



PM me your email for a copy of the parts manual.
 
125a said:
. . . PM me your email for a copy of the parts manual.
Click to expand...
And that right there is what makes this website so great :clap:

I'm not aware of any other website where people are willing to be so helpful to others who are in a jam.
 
your low compession gould be a broke valve spring or a burnt valve my experiance with flat head jeeps and dodge engines valves are pretty easy to replace and if you need to grind seats you can do it still in the vehicle head comes off easy take and remove ahe valve core from your compression tester hose and get a coupler that matches your hose bring the engine to tdc for the cylinder you are testing slowly apply air and listen for the leakage through the carb intake valve throughthe exhaust exhaust valve through the oil filler rings or piston make sjhure the engine is locked down don't try to hold the wrench on the fly wheel with your hands you could get hurt.
 
Before you throw in the towel on that engine... Flatheads blew the head gaskets pretty often. You may first pull off the head which is a very easy task and take a look at the gasket area. You may find that it blew and the "Smoke" you see is from the Antifreeze. If that is the case, get the head milled (Shaved or flatten so it is flat) at a machine shop and put it back on with a new gasket.

When you tighten it down with the new gasket, start in the center head bolt at about ten pounds torque and do a star pattern out from there and then set it at twenty pounds and so forth til you get it to what the head bolts are set at.

Very easy job to do verses yarding the entire engine out and replacing it when it may not be bad to start with.

If you pull the head off, take some photos and post them where we can see the head gasket and track lines around each cylinder.

Good Luck!

As a note, that is probably a "Hurricane" engine. They were made with a Chrome Molly blocks and almost never wore out, but did blow and occasional head gasket. IF you get the head off and look where the piston comes up and the rings stop, on most engines you will have a ridge there you can catch your fingernail on, the Chrome Molly blocks were so hard they didn't wear out, the rings did and they were finely replaced with the slant six which wore out a lot quicker, thus engine sales went up. The valves would burn, but the valve seats looked new and a simple hand lapping them in was all it took for new valves.
 
fogtender said:
Before you throw in the towel on that engine... Flatheads blew the head gaskets pretty often. You may first pull off the head which is a very easy task and take a look at the gasket area. You may find that it blew and the "Smoke" you see is from the Antifreeze. If that is the case, get the head milled (Shaved or flatten so it is flat) at a machine shop and put it back on with a new gasket.

When you tighten it down with the new gasket, start in the center head bolt at about ten pounds torque and do a star pattern out from there and then set it at twenty pounds and so forth til you get it to what the head bolts are set at.

Very easy job to do verses yarding the entire engine out and replacing it when it may not be bad to start with
If you pull the head off, take some photos and post them where we can see the head gasket and track lines around each cylinder.

Good Luck!

As a note, that is probably a "Hurricane" engine. They were made with a Chrome Molly blocks and almost never wore out, but did blow and occasional head gasket. IF you get the head off and look where the piston comes up and the rings stop, on most engines you will have a ridge there you can catch your fingernail on, the Chrome Molly blocks were so hard they didn't wear out, the rings did and they were finely replaced with the slant six which wore out a lot quicker, thus engine sales went up. The valves would burn, but the valve seats looked new and a simple hand lapping them in was all it took for new valves.
Click to expand...
good idea also when doing the earlyer described leakage test if you get bubbles out the raidator look at the head gasket or the head.
 
alongstreet said:
Flathead 6 Chrysler, compression is 118psi on 5 cyl, 78psi on 1 cyl, motor runs with half choke and TONS of blue smoke, no power, we were plowing snow like you wouldn't believe, parked it, next day would not run.

Do we rebuild the engine, replace, what about a 251 non industrial substitute ? Any ideas appreciated.

How difficult is it to pull the engine ?

Thanks
Andrew
Click to expand...

one thing to remember on these flathead 251 Chrysler's is they have a Governor for a reason if you over rev them they with pop the head off the valve. otherwise they are very long lived engines

all parts are still available, except the exhaust manifolds. there is a company making the 231 manifolds and we have try to talk them in to making the 251
they are considering
 
Got one just like it. Engine runs great but has a nasty knock growing down deep. When she goes, I'm gonna plop a 4 cyl diesel into her...This one actually does work for a living though. Not much playing. From what I see the only thing to really consider is the engine mounts (easy to modify though) and, at least on mine, the fan blades are backwards.
 
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