Lincoln Sa-250 engine problems

[salu]

so I bought a old 1980s Lincoln Sa-250(gas) for $500.00. I cleaned the carb an plugs, distributor is new! Runs good besides the fact that the exhaust valve isn't seating fully. it sounds like only one is bad an wondering what your guys input on this an how to take care of it? I like to take head off an take emery cloth to them to clean build up! let me know what you guys suggest! thanks

[gnforge]

Lincoln Sa-250 engine problems

When I was a young kid (60's) I would watch my grandad pour transmission fluid into carb wile engine running, now that would clean the flys out of a garage. Well I guess that was when we still had lead in gas. Doesn't really apply today. But watched him fix more than one engine that way.

[salu]

Would any transmission fluid work for putting into carb? I mostly think its carbon build up on the valve or the seat! I never heard of using transmission fluid ! Ill have to give it a shot! Wont hurt to try!

[gnforge]

Lincoln Sa-250 engine problems

They do make a cleaner for carbon buildup.
Chrysler as the other big three have had this problem and hv recommended cleaners to run through. My local small engine auto part store uses Sea Foam and swears by it. I'm just a welder. Maybe the mechanics will jump in.

[salu]

I heard sea foam is pretty good in anything! anyone one got anything on using seafoam to clean the engine? hate to pull the head off just for that reason!

[snoeproe]

I use sea foam in all my small motors.
It's a fuel conditioner, water remover, carb cleaner etc all in one. Good stuff.

[H80N]

so I bought a old 1980s Lincoln Sa-250(gas) for $500.00. I cleaned the carb an plugs, distributor is new! Runs good besides the fact that the exhaust valve isn't seating fully. it sounds like only one is bad an wondering what your guys input on this an how to take care of it? I like to take head off an take emery cloth to them to clean build up! let me know what you guys suggest! thanks

could you give us the code # and engine type so we can get you the proper manuals??

here is the link to the manuals for the whole Lincoln range... just plug in SA-250... or your model code number to get the proper manual...

http://www.lincolnelectric.com/en-us/support/Pages/operator-manuals.aspx

am going to take a SWAG at the engine and guess Continental...
so here is the L-Head manual...

http://igor.chudov.com/manuals/Continental-Engines/Continental-L-Head-F-163-etc-Overhaul-Manual.pdf

figuring it is probably an F-163

BTW... I would probably pull the plugs and squirt in a liberal amount of Kano Kreen or PB-Blast into each hole and rotate it a few turns... repeating a few times over a couple of days...
Also... have you changed oil and filter yet... I would..

[bjfab]

Valve grind time

Byron

[H80N]

More Current Versions...

Valve grind time

Byron

Or at least a valve adjust...

here are more current versions of the manuals...

Continental L-Head operators and maint manual (Includes F-163)

http://www.wisconsinmotors.com:8080/wm/images/catalogs/continental/L-Head_OperatorsGuideRepair.pdf

Overhaul manual

http://www.wisconsinmotors.com:8080/wm/images/catalogs/continental/L-Head_Overhaul.pdf

[cruizer]

What it do is put 2 of those small containers of stp carb cleaner in the tank, run the unit up on high idle for an hour, leave it sit over night, then throw the machine on a load bank ( you can weld with it with 3/16") then watch the chunks of carbon spray out of it. Presto perfect working engine again.

[bjfab]

Additives are for prevention. The cure is a valve grind.

Byron

[Tryagn5]

engine.

Not sure if its a flathead design or ohv design. I would certainly check valve adjustment and be darn sure there is not a bent or broken valve spring. If all is good i would try seafoam. If that fails, time for a valve job.
Kevin

[cruizer]

Sure you can do a full rebuild , however, like the sa200's you leave the manifold heater hose on all year, machine runs like crap. Starts burning blue. Rebuild nope. Just load er up, found Stp loosends the carbon.

like a shower of meteorites out the stack. Presto valves and piston heads and rings are unstuck and clear of crap

[bjfab]

1. Incorrect valve lash
2. Valve spring broken, overheated, keepers out of place(flathead), etc.
3. Burnt or poor seating valve

It has already been determined by the owner that one exhaust valve is not fully seating. Cylinder leakage test will determine this after a compression test has been done. No additive makes valves seat!

My guess is that this welder sat for a number of years and moisture does damage.

Byron

[gnforge]

Lincoln Sa-250 engine problems

Debate all day, start easy & cheap work your way up. Or just blow your wad all at once, I know my choice.
And yes carbon will build up around stem and you guessed it valve does not seat, slight leak, engine miss. Yea valve grind will fix as long as they clean carbon off!! But the liquid fix is the 1st. Go to, then proceed from that.