changing 1 piston in 1987 evinrude 115

[emdsapmgr]

Re: changing 1 piston in 1987 evinrude 115

The tl model engine is a 1983. Those engines did not have the expensive combination VRO pump, just the simple, small fuel pump. Both heads have temp switches in them. They go to ground when the head temps reach 212 degrees and either/both can sound the warning horn in the control box. The hot horn silences when the head temps go back down to 175. You can still have an internal cylinder overheat which will not necessarily set off the horn-if the water diverters are missing, out of position or if there is debris in the passage restricting water flow. Check your factory manual for their specific placement. You can have an overheat and still have a strong telltale. The telltale shows the condition of the impeller, but does not indicate whether either of the two thermostats are functioning (opening) properly.

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

I see . I brought the blok to the marine machine shop today along with the pistons and the 2 .030 pistons I have from the spare motor. he said I should open the 2 cyl that had the damage and .030 was plenty to fix the prob. he said pistons were good to use as well. Hes getting me the gaskets and seals ,thermostat kit,water deflectors,water pump impeller ,rings and is going to hone the other 2 cyl also. it'll be done in a week and still close to my budget.. sweet. then I can put it back together. to test the buzzer can I pull the temp switches out of the heads and drop them in some boiling water.probablly have to hook a ground to them right? after the engine is back in of course

 

[ezeke]

Re: changing 1 piston in 1987 evinrude 115

I see . I brought the blok to the marine machine shop today along with the pistons and the 2 .030 pistons I have from the spare motor. he said I should open the 2 cyl that had the damage and .030 was plenty to fix the prob. he said pistons were good to use as well. Hes getting me the gaskets and seals ,thermostat kit,water deflectors,water pump impeller ,rings and is going to hone the other 2 cyl also. it'll be done in a week and still close to my budget.. sweet. then I can put it back together. to test the buzzer can I pull the temp switches out of the heads and drop them in some boiling water.probablly have to hook a ground to them right? after the engine is back in of course

It is unlikely that you will be able to pull the temperature switches out of the cylinder heads without damaging them beyond repair. You will need to remove the water covers from the cylinder heads in order to remove them.

You test the horn and wiring by disconnecting the wire a few inches out, and grounding the control end of the wire to the block with the ignition switch turned to the run position.

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

but how about testing the switches?

 

[ezeke]

Re: changing 1 piston in 1987 evinrude 115

but how about testing the switches?

To test the switches you have to remove them.

You said ".. to test the buzzer can I pull the temp switches out of the heads and drop them in some boiling water.probablly have to hook a ground to them right?" That will test the switch, not the horn. You use an ohmmeter and (usually) heated oil rather than water. You also use a thermometer.

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

no that will test the whole alarm system

 

[hayuuga]

Re: changing 1 piston in 1987 evinrude 115

well...
if you r doing a rebuild you want to clean the heads at the same time.
just trow the complete cyl.head in a pot of water or if you worry about water and sensors. use the oven. . warm to spec. alarmtemp. + a couple of ?. wait hold the temp there to let the sensor to react, then mesure the resistans to check if it has closed the alarm loop.

Best regards

David

 

[ezeke]

Re: changing 1 piston in 1987 evinrude 115

no that will test the whole alarm system

The switch depends on good thermal contact as well as a good electrical ground when in use. You test the switch by heating it to the point where it closes, which is 212? +/-6? F. if the temperature switch wires are solid tan.

The boiling point of water at sea level is 212?, and it goes lower with altitude. For this reason it may not be possible to test the switch with water, which is why the manuals all say to use oil.

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

sounds good .i'll give it a wirl

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

some one told me today not to put thermostats back in. in a car ,you need it to give the water time to cool in the radiator but what about a boat?

 

[ezeke]

Re: changing 1 piston in 1987 evinrude 115

The themostats control the flow of water out of the engine's cooling passages. Without the thermostats the engine will run cold, contributing to carbon fouling of the plugs and firing chambers, and the cylinders will not maintain their correct shape, contributing to excessive wear.

 

[GatorMike]

Re: changing 1 piston in 1987 evinrude 115

http://www.crowleymarine.com/johnson-evinrude/5995.cfm

Thought this might come in handy. The parts diagram for the model number you gave.

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

thats awesome! thank you

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

OK ,I got the block back from the machine shop and all the gasket and parts . got everything cleaned up and plan on assembling it tomorrow . in the manuel it says dont put anything together dry. does this mean the bolts or gaskets or both? what should I use on each. I got locktite 518 gasket maker for the block halves . that is what the machine shop guy told me to use. he said to use grease on all the bolts? is there any thing special for the head bolts or any thing else on it ? This is my first outboard . Ive built many car engines .just want to do it right the first time.
thanks

 

[trendsetter240]

Re: changing 1 piston in 1987 evinrude 115

OK ,I got the block back from the machine shop and all the gasket and parts . got everything cleaned up and plan on assembling it tomorrow . in the manuel it says dont put anything together dry. does this mean the bolts or gaskets or both? what should I use on each. I got locktite 518 gasket maker for the block halves . that is what the machine shop guy told me to use. he said to use grease on all the bolts? is there any thing special for the head bolts or any thing else on it ? This is my first outboard . Ive built many car engines .just want to do it right the first time.
thanks

Which manual do you have, is it the OMC original service manual?

I'm not sure what locktite 518 is but i've rebuilt 3 inline 3cyl 70hp motors this year and always used OMC Gel Seal on the crankcase halves. This is what was recommended in the manuals.

Also, don't use any grease when assembling the crank, bearings, rods and pistons. Use only 2-cycle oil. Anything that goes inside the crankcase must be soluble in gasoline.

I never use grease on head bolts, just cleaned then lightly oiled with 2-cycle oil.

EDIT: If you`re interested I documented my first rebuild on this site last year. Not identical to your v4 rebuild but might be helpful. Here`s the link http://forums.iboats.com/showthread.php?t=361179

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

yea ,I have the omc man . It says use gel seal .I beleive its the same . reading the instructions on it. the boat guy knew what it was so I assume its right

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

what did you use for gasket sealer on the head gaskets? car engines go on dry. in the manuel it says use gasket sealer unless the gaskets say not to. I havent checked to see yet but that is different then what I am used too

 

[bktheking]

Re: changing 1 piston in 1987 evinrude 115

I've never done a 115 headgasket, the rest I have done use no sealer.

 

[demon1]

Re: changing 1 piston in 1987 evinrude 115

thats what I thought .thanks .what about the other gaskets?

 

[trendsetter240]

Re: changing 1 piston in 1987 evinrude 115

thats what I thought .thanks .what about the other gaskets?

Head gaskets and exhaust cover gaskets are the only ones that need gasket sealing compound according to my manual.