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Guess Pan Engine Problem

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Chopchop
Posts: 11
Joined: Mon Jun 01, 2009 6:23 pm
Bikes: 1949 EL, 1966 TR6C
Location: Minneapolis, MN

Guess Pan Engine Problem

#1

Post by Chopchop » Mon Jun 01, 2009 8:27 pm

I am new to this site, from what I have seen so far it is awesome! It just took my 49EL out of an about a one year storage. It is an older restoration, about 95% original or correct parts. After checking all the fluids, it started on the first kick (as usual). After a warm-up, I took it for a little spin; it ran a little rough, probably due to the stanky over-stabilized gas. The next day, I started it up. It ran really rough; the front cylinder wasn’t firing. Shut it down, checked spark – it was good. Check compression – none in the front cylinder! I am going to look into further tonight starting with the push rods. Any guesses what the problem is? I would think even with a blown head gasket there would be a little compression. I hope it isn’t what I think it is. Any guesses what the problem is?



rrhawg
Posts: 93
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Bikes: 59 Pan, 65 Pan, 45 Wl, 46 UL, 41 Chief, 48 Chief, 50 Chief, 53 Hummer, 53 Simplex, and misc. others
Location: Newport, Oregon

Re: Guess Pan Engine Problem

#2

Post by rrhawg » Mon Jun 01, 2009 8:50 pm

My initial guess would be a stuck valve, the stems will corrode from sitting and then stick. Do not turn it over anymore until you know, as the piston can come up and hit, which can bend the valve or damage the piston.
You can pull the pushrod covers and see if one has a lot of play, or pull the pushrods and put pressure in the spark plug hole, if it leaks through the carb or exhaust you will know.
Rich

chopperzz
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Re: Guess Pan Engine Problem

#3

Post by chopperzz » Mon Jun 01, 2009 9:05 pm

sometimes a gasket failure will also give you a pronounced "pssst" sound on the compression stroke

Chopchop
Posts: 11
Joined: Mon Jun 01, 2009 6:23 pm
Bikes: 1949 EL, 1966 TR6C
Location: Minneapolis, MN

Re: Guess Pan Engine Problem

#4

Post by Chopchop » Tue Jun 02, 2009 12:34 am

You were right Rich, the intake pushrod is sloppy loose. I guess it is time to dig in.

Chopchop
Posts: 11
Joined: Mon Jun 01, 2009 6:23 pm
Bikes: 1949 EL, 1966 TR6C
Location: Minneapolis, MN

Re: Guess Pan Engine Problem

#5

Post by Chopchop » Sat Jun 06, 2009 4:21 am

I took off the front head & the inlet valve is stuck open about 1/4". No hit on piston, but there may have been a very slight "touch" on the exhaust valve. This is a 49EL engine, the head casting says 1948; I noticed there isn't an inlet vlave oiler. Could this have caused the stuck valve? Also, I have previously noticed that the engine "coughed" occasionally & on acceleration; maybe this was a sign that the inlet valve was always sticking. I always thought it was a carb issue?

Any suggestions on best way to proced with repair & if I need the inlet oiler. I didn't take off the rear head since I don't usually fix what isn't broke...

Ohio-Rider
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Joined: Tue Jan 25, 2005 3:04 pm
Location: North-East Ohio

Re: Guess Pan Engine Problem

#6

Post by Ohio-Rider » Sat Jun 06, 2009 3:59 pm

When doing a top end job I feel its always best to due both heads together. You wouldn't just purchase one shoe at the shoe store would you? In the long run it's ussally cheapest to do them both now anyway.

preacher
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Re: Guess Pan Engine Problem

#7

Post by preacher » Sat Jun 06, 2009 5:12 pm

I had a intake valve that stuck on occasion on a ironhead...had to take it all apart and put grease ot the stem,and then put it back together.it was all better ....

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