1984 starcraft islander

[havoc_squad]

Finally got around to doing a compression test on the engines. I don't think it looks good but I'm not an engine expert.

Left
1= 100
3=75
2=110
4=90

Right
1=75
3=90
2=80
4=80

Based on those numbers, looks like the left engine on the port side cylinders overheated at some point.

You may be fortunate if they sat around forever without being ran and some aggressive decarboning may help to free up the rings but I doubt it.

If you want a real picture of where things are at without removing anything yet, you would want to get a leak down tester and do a leak down test before disassembling anything.

There's only three places the air can leak out from (the block/crankcase/head, exhaust, or cooling system).

What everyone who actually knows (fastbullet & racerone and a few more) will likely say is at least the bypass covers need to be removed for inspection of piston wall and piston rings.

More likely though the head has to come off and bypass covers to get a full picture.

Take lots of pictures and label them properly on where they are from.

 

[Scott Danforth]

Try some ring free, then get them running and then test

 

[jdvasher]

Finally got around to doing a compression test on the engines. I don't think it looks good but I'm not an engine expert.

Left
1= 100
3=75
2=110
4=90

Right
1=75
3=90
2=80
4=80

I'm not exactly sure what engine you're running but I'm assuming a Chevy 5.7 from my personal experience and what I've read along the way 100 PSI is pretty much the bottom for most engines. You lowest shouldn't be less than 70% of the highest.

 

[racerone]

This boat has a pair of 90 HP outboards.-----I would remove bypass covers on the 75 PSI cylinders.

 

[Scott Danforth]

I'm not exactly sure what engine you're running but I'm assuming a Chevy 5.7 from my personal experience

Twin outboards . Covered earlier in the thread

 

[airshot]

Might pull the plugs an give each cylinder a shot of storage oil before turning it over.

 

[Neschenbrenner]

I was really hoping I would get lucky and not have to mess with these engines.

 

[Neschenbrenner]

Would this be worth picking up? I think it should cover my engines.

 

[racerone]

I can't grab a hold of those engines.----Some simple inspection on your part is needed.

 

[havoc_squad]

Would this be worth picking up? I think it should cover my engines.

View attachment 377212

For marine use, those after market ones are only good for fire starting (garbage), avoid if you don't like regretting purchases and having to buy twice.

Buy the factory service manual instead. Easily available via Ken Cook for legal printed reproductions or sometimes they are available via E-Bay.

Search for it by the transom bracket tag model number.

You can do a search on E-bay with the manual's part number to see if they have an original print, which usually is cheaper.

 

[Scott Danforth]

Would this be worth picking up? I think it should cover my engines.

View attachment 377212

only if you need to level your couch or if you need knee pads.

the seloc manuals make really bad toilet paper...... and worst manuals.

get a factory manual direct from the publisher (yes, the only licensed OMC manuals) https://outboardbooks.com/

 

[Neschenbrenner]

I think I'll focus on getting the boat itself squared away then I tackle these engines. I think I should try and avoid tearing everything apart at one time.

 

[airshot]

I was really hoping I would get lucky and not have to mess with these engines.

You will always have to mess with the engines in one way or another...it is a boat...something always needs messing with !!

 

[Neschenbrenner]

Any tips on getting the gas tank out? I'm really struggling. Lol. I tried cutting around the foam and prying but no dice.

 

[Scott Danforth]

If you can get a ratchet strap around one end, you can put tension on it

 

[Neschenbrenner]

Great success!
Was probably 30 gallons of this old gas in the tank. Lol

 

[airshot]

My 1983 Islander tank was replaced with an aluminum tank, also moved forward for better balance. Boy that is some ugly fuel !!

 

[Neschenbrenner]

My 1983 Islander tank was replaced with an aluminum tank, also moved forward for better balance. Boy that is some ugly fuel !!

Think I should put this tank back in? What kind of modifications can I do when I start putting her back together for better performance?

 

[racerone]

You will like the performance of that boat with 2 sweet running 90 HP motors.----Or once motors have proved themselves you could look into making them into 115 HP each.

 

[Sharpie223]

If it was me, I'd pressure test that tank. If it held pressure then I would clean up the outside, and then figure out a solvent for the inside, using it until it ran mostly clear. What material is the tank made from?