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evinrude 4hp seized

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phil123

New member
hi,i have an 1984 (I think)evinrude 4hp outboard which has not been started in a couple years and is now seized up,i have taken the head off and sprayed wd40 in at pistons but is still solid,i am wondering if there is any way to put pressure on pistons to get them to move ,thanks
 
Have a piece of wood sitting on top of the piston, then tap it with a hammer.

Has the engine been under water or exposed to heavy rain? If so, in all probability the rods, bearings, crankshaft are rusted.
 
no it has not been under water but was stored in a damp shed for a couple years ,there is still some rust in the cylinders
 
Mix up some acetone and ATF 50-50, put that in the cylinders and leave it sit. Every so often give the piston a rap with the block of wood and the hammer.
 
Have you pulled the gearbox? You need to remove the powerhead to disconnect the shift rod then drop the gearbox and see if the motor turns over. it will need a impeller anyways before you run it. There is a allen head set screw to disconnect the shift rod.
 
Thanks for the help lads,with a few sprays of penetrating oil and a couple taps of the hammer I have pistons free again,not sure If I done any damage to the rings or not ,any ideas on how I will know if any damage done
 
phil123 said:
Thanks for the help lads,with a few sprays of penetrating oil and a couple taps of the hammer I have pistons free again,not sure If I done any damage to the rings or not ,any ideas on how I will know if any damage done
Click to expand...

When you have the engine turning over freely and have cleaned the cylinders, piston tops, and sealing surfaces of the block and head.... install a new head gasket, torque the head bolts to their factory specification (60-80 Inch Pounds) in the sequence listed below where each number stands for a bolt, then check the compression.

5....6
1....2
4....3
 
Hi ,I got my head gasket and have it fitted now ,I still cannot get motor going now as I don't seem to have a spark,i have installed 2 new spark plugs
 
Look on the port (left) transom bracket for a small plate that will have the model and serial number. With the "model number" we can pinpoint exactly what engine you have.

If it has ignition points, they might be oxidized and cleaning and resetting them might take care of the no spark problem. However with the flywheel off, you'll be able to inspect all components under that flywheel.

Remove the flywheel with either a harmonic balance puller or a steering wheel puller, using the three threaded holes that surround the flywheel nut. If points and condenser exist, the points should be set so that a .020 gauge goes through but a .022 does not... set points when the flywheel key is aligned with the fiber rubbing portion of the points that slides against the crankshaft.

Get back to us with that model number.
 
I just went through a 1982 basically the same motor. You can clean the points to see if you can get it running but I recommend new OEM points for extended service life. That motor is extremely sensitive to point gap mine runs best if you use a timing light to adjust the points. There is two marks on the points plate and two marks 180 degrees out on the flywheel. The mark on the flywheel needs to be inbetween the two marks on the plate just hook the timing light to a car battery. It is time consuming but will run alot better if you use the timing light instead of the points gap. Like was said start out at exactly .020 and check it with the timing light once running.
http://cgi.ebay.com/ebaymotors/ABN-...046088?hash=item51da8d53c8:g:HqoAAOSw14xWQMs7
Use this type of puller with 3 inch 1/4 20 grade 8 bolts. make sure the bolts are in at least 5 good threads.
 
Ok, the model number is E4BRCRM AND ITS AN 1984 4hp evinrude, thank you


QUOTE=joereeves;537077]Look on the port (left) transom bracket for a small plate that will have the model and serial number. With the "model number" we can pinpoint exactly what engine you have.

If it has ignition points, they might be oxidized and cleaning and resetting them might take care of the no spark problem. However with the flywheel off, you'll be able to inspect all components under that flywheel.

Remove the flywheel with either a harmonic balance puller or a steering wheel puller, using the three threaded holes that surround the flywheel nut. If points and condenser exist, the points should be set so that a .020 gauge goes through but a .022 does not... set points when the flywheel key is aligned with the fiber rubbing portion of the points that slides against the crankshaft.

Get back to us with that model number.[/QUOTE]
 
E4BRCRM..... Yes this 1984 model would have under it's flywheel 2 points, 2 condensers, 2 coils. This would be your starting point in correcting any ignition problem.
 
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