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Lincoln Sa-250 engine problems

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  • H80N
    replied
    Originally posted by cruizer View Post
    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.
    Think I would start here and see what happens....

    Leave a comment:


  • Tryagn5
    replied
    temp gun.....

    Originally posted by salu View Post
    alright, so I just got in from working on it! my cylinders are clean, valves/seats are good, springs are good, rollers to valve gapes are all been adjusted to right specs, spark good on all cylinders! I couldn't find a lot wrong with it! two of the exhaust valves were out of spec and had to be readjusted! there isn't much bad with the engine its self! does have a new head gasket since I pulled the head off to look at valves/seats! I still have running issues! it seems like the spark is off a degrees or something! it spits a little flame out so something isn't set right or not adjusted right!
    code#4369
    engine#151806
    its the continental flat head with electronic ignition, oil filter
    First does the engine miss on any particular cylinder? My favorite tool fot troubleshooting a poor running engine is a laser temp gun. Start with a cold engine, use your temp gun to shoot each of the exhaust ports with the engine running, they all should be within 50 degrees of each other after a few jinutes of running, if one is much colder you have found your weak cylinder. If the temp is good, you will have to be sure your advance is not faulty in the distributor, 180 degrees off, or a tooth off. Hopefuloy you have done a compression check to confirm the engine has the proper compression. Also as you run the engine have in inline spark tester on one of the plugs, i have seen many pull there hair out because of a weak coil.
    Kevin

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  • H80N
    replied
    Originally posted by salu View Post
    sorry, that's just for the engine! my fault there!
    face place tag is;
    SA25 F-163
    9054
    A-1069026
    Aaahhh... much better... here ya go...

    http://www.lincolnelectric.com/asset...oln3/im328.pdf

    Leave a comment:


  • salu
    replied
    sorry, that's just for the engine! my fault there!
    face place tag is;
    SA25 F-163
    9054
    A-1069026

    Leave a comment:


  • H80N
    replied
    Originally posted by salu View Post
    alright, so I just got in from working on it! my cylinders are clean, valves/seats are good, springs are good, rollers to valve gapes are all been adjusted to right specs, spark good on all cylinders! I couldn't find a lot wrong with it! two of the exhaust valves were out of spec and had to be readjusted! there isn't much bad with the engine its self! does have a new head gasket since I pulled the head off to look at valves/seats! I still have running issues! it seems like the spark is off a degrees or something! it spits a little flame out so something isn't set right or not adjusted right!
    code#4369
    engine#151806
    its the continental flat head with electronic ignition, oil filter
    problem with code# 4369... it comes back to an Idealarc TIG 300/300...
    not an SA-250....

    Leave a comment:


  • salu
    replied
    alright, so I just got in from working on it! my cylinders are clean, valves/seats are good, springs are good, rollers to valve gapes are all been adjusted to right specs, spark good on all cylinders! I couldn't find a lot wrong with it! two of the exhaust valves were out of spec and had to be readjusted! there isn't much bad with the engine its self! does have a new head gasket since I pulled the head off to look at valves/seats! I still have running issues! it seems like the spark is off a degrees or something! it spits a little flame out so something isn't set right or not adjusted right!
    code#4369
    engine#151806
    its the continental flat head with electronic ignition, oil filter

    Leave a comment:


  • bjfab
    replied
    Tools required

    Leave a comment:


  • gnforge
    replied
    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.

    Leave a comment:


  • bjfab
    replied
    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

    Leave a comment:


  • cruizer
    replied
    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

    Leave a comment:


  • Tryagn5
    replied
    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

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  • bjfab
    replied
    Additives are for prevention. The cure is a valve grind.

    Byron

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  • cruizer
    replied
    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.

    Leave a comment:


  • H80N
    replied
    More Current Versions...

    Originally posted by bjfab View Post
    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/...uideRepair.pdf

    Overhaul manual

    http://www.wisconsinmotors.com:8080/...d_Overhaul.pdf
    Last edited by H80N; 12-23-2014, 12:48 PM.

    Leave a comment:


  • bjfab
    replied
    Valve grind time

    Byron

    Leave a comment:

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