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Cub only runs on Cylinders 1and 2
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- 10+ Years
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Cub only runs on Cylinders 1and 2
My cousin's Cub had a bearing knock so we put new bearings in. While we were there, we put new rings in (standard) and lapped the valves. He has owned the Cub since 1965 and this was the first time the engine was taken apart. There was very little cylinder wear ( didn't need a ridge reamer to get the pistons out). We put it back together and now it runs only on cylinders 1 and 2. There is spark at all 4 plugs. We checked each valve by putting brake cleaner on them and none leaked. Any ideas? Thanks!!
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Re: Cub only runs on Cylinders 1and 2
Yellowcub, Welcome to the Forum. I just found your post from yesterday. First thing I would check is that you have the spark plug wires in the right order coming out of the cap to cylinders 3 and 4.
Bob
Bob
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Re: Cub only runs on Cylinders 1and 2
firing order 1342
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Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
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Re: Cub only runs on Cylinders 1and 2
How does brake cleaner help test valves for leakage?
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- ricky racer
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Re: Cub only runs on Cylinders 1and 2
A compression test will be helpful here. But then again, my John Deere B runs on 2 cylinders, but you know, after a while you get use to it.
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
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Re: Cub only runs on Cylinders 1and 2
ricky racer wrote:A compression test will be helpful here. But then again, my John Deere B runs on 2 cylinders, but you know, after a while you get use to it.
Pull off one wire and see how she does
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Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
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- 10+ Years
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Re: Cub only runs on Cylinders 1and 2
The firing order is ok. Tried new cap and rotor. We took the head off again and sprayed brake cleaner around each closed valve (Ponded) and none seeped down. We did a compression test a while back before we took the head off again . I forget the psi but 3 and 4 were low until we sprayed oil in those cylinders. I am thinking the new rings in cylinders 3 and 4 didn't seat. We pulled the pistons again and I checked the ring gap and it was within spec.
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Re: Cub only runs on Cylinders 1and 2
Timing light. Cylinders 1 and 4 fire at the pulley and pointer indicators. Cylinders 2 and 3 fire 180 degrees off the pulley and pointer.
I have an excuse. CRS.
- ricky racer
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Re: Cub only runs on Cylinders 1and 2
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
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- 10+ Years
- Posts: 19
- Joined: Wed Mar 19, 2014 9:10 pm
- Zip Code: 06415
Re: Cub only runs on Cylinders 1and 2
We put a timing light on each plug wire. 1 and 4 fired at the timing mark and 2 and 3 fired 180 degrees from the timing mark. ( made another white mark)
- ricky racer
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Re: Cub only runs on Cylinders 1and 2
Have you taken a compression test? What kind of readings did you get? Check it first dry then wet and record your readings and report back. Until then, we're only guessing.
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
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Re: Cub only runs on Cylinders 1and 2
like Ricky said do a compression test. Also is the spark occuring on comp stroke or exhaust stroke? Just because the spark occured at the mark on the crankshaft pully doesnt mean it was on the compressin stroke. You may need to move your spark plug wires on your distributor.
Pete from Virginia Beach
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