1988 johnson 88 spl compression (is this ok)

[mulishatroop940]

i have a 1988 johnson 88 spl outboard just did a compression check looking from the back of the boat both top cylinders are at 121 psi the right lower is at 116 the left lower is at 119 is this all normal boat runs great just figured i would do a compression test i hate doing them but please let me know it those sound good

 

[Boss Hawg]

Re: 1988 johnson 88 spl compression (is this ok)

All well witin 10% of each other - good to go

 

[kybill66]

Re: 1988 johnson 88 spl compression (is this ok)

Yes that is ok as long as you don't 15psi difference between cylinders then it is rebuild time.

 

[mulishatroop940]

Re: 1988 johnson 88 spl compression (is this ok)

thanks you guys alot ur alot of help....

 

[kenmyfam]

Re: 1988 johnson 88 spl compression (is this ok)

i have a 1988 johnson 88 spl outboard just did a compression check looking from the back of the boat both top cylinders are at 121 psi the right lower is at 116 the left lower is at 119 is this all normal boat runs great just figured i would do a compression test i hate doing them but please let me know it those sound good

Looks good to me.

 

[junior1113]

Re: 1988 johnson 88 spl compression (is this ok)

excelent #'s for a 20 yr old motor good to go

 

[mulishatroop940]

Re: 1988 johnson 88 spl compression (is this ok)

so the motor has alot of life left on it.. also my other question is i was reading in my manuel of the motor and it says it has a S L O W sensor which runs off a temp sensor on the motor for if it gets to hot the motor wont run of 2400 rpms my only question is i always check to see if water is coming out of the hole up top but i just bought the boat and it doesnt have a warning buzzer that i know of ppl say it can over heat even though water is coming out from up top ???? is this true should i run a temp guage and where should i connect it to if sol... the boat is a 1988 bass skier

 

[mulishatroop940]

Re: 1988 johnson 88 spl compression (is this ok)

? any one

 

[tashasdaddy]

Re: 1988 johnson 88 spl compression (is this ok)

the tale tell stream, only show that water is pumping, not that the thermostats are opening and cooling the block. mount temp sensor on the upper part of the water cover, on the head.

 

[JB]

Re: 1988 johnson 88 spl compression (is this ok)

imsurethereisaquestionintheresomewherebutwithnocapitalsandnopunctuationi cantfindit

 

[mulishatroop940]

Re: 1988 johnson 88 spl compression (is this ok)

how do u know if the thermostats are opening.. is there a safety thing on them like something to help keep u from blowing it up...

 

[mulishatroop940]

Re: 1988 johnson 88 spl compression (is this ok)

i just dont wanna have over heating problems... also when i did my compression test i pulled one plug out at a time i didnt remove all plugs and do it i dont think i would have 120 psi in the cyclinders if i had a blown head gasket.. just wondering if u can compression test it taking one plug out at a time

 

[jonesg]

Re: 1988 johnson 88 spl compression (is this ok)

yeh but the readings will be low if you only remove one plug, take them all out and let it spin freely ,

watch your compression numbers go up.

Buy a temp guage that comes with the sensor and wiring, follow the directions, if the temp starts going up and keeps going you're overheating.
If it stays in range its good to go.

 

[mulishatroop940]

Re: 1988 johnson 88 spl compression (is this ok)

so i mount the temp guage on the upper part of the water plate if ur looking at the back of that motor the water plate has that 50 screws that bolts to all the heads....

 

[mulishatroop940]

Re: 1988 johnson 88 spl compression (is this ok)

........

 

[junior1113]

Re: 1988 johnson 88 spl compression (is this ok)

there is a way of grounding the wire on the over heat sensor to see if it works if the alarm goes off run until u hear that noise if no noise no problom this can be done with paper clip