93 Evinrude 150 Intruder compression

[triplehooked]

Hello all!

I'll get right to it. The port side bank on my engine has zero compression on all 3 cylinders. Starboard side is 93,95, and 98 respectively. I've worked on cars and heavy equipment for a living, but not on two stroke engines. Could a blown head gasket cause zero compression on an entire bank?

Back story... 93 Ranger 363 V acquired from my dad two years ago that has always ran well and has had routine maintenance. Ie... plugs, greased, lower unit oil changed, impeller, etc.. Although when I got it, it never really planed out quickly (possibly from a head gasket partially blown?). I was told that it previously planed fast. Anyways, I replaced the batteries, bilge pump, etc.... in preparation for some spring walleye fishing. Ran the motor on muffs at the house and it fired right up, great water pressure from the tell tale. That was on old gas as well! I filled the tanks with premium gasoline and headed to the local lake to for a test run before heading to the Detroit river. About half way across the lake at full throttle it died. restarted but barely ran above an idle in gear (still had great water pressure from the spout) and finally quit altogether, requiring a thorough use of my new trolling motor batteries. After checking the plugs on the water I finally gave up and headed home, where I completed the above compression test. Any ideas here as to what may have happened?

Thanks guys.

 

[racerone]

The motor may not have a head gasket.-----An o-ring for each cylinder.-----Is oil injection in service and oil output verified ?

 

[bob johnson]

that motor does not have head gaskets..... there is a large O-Ring around EACH bore on the head.... so all three woul dhave top be bad, and even then you wouldnt lose ALL compression.....i wouldnt think........

 

[triplehooked]

Oil injection was working that I could tell as I could see the typical two stroke smoke. What are the procedures to verify proper oil injection? I plan on buying a good manual to help with this regardless. What type is recommended? I wanted to see if there were any typical issues with these engines that may cause this. Any and all info. is welcomed.

 

[racerone]

If your gauge is verified good you might as well take the head off to have a look in there.----Zero compression on 3 sounds expensive.

 

[bob johnson]

those are very good motors, but some of the early V6 versions of that style motor(like yours) had a weak-thin wall cast at the factory and as such some motor leaked through into ( I THINK THE #1CYLINDER) otherwise they dont have much in the way of issues related to just that motor......id vaerify youve got a workable motor before i bought the manual.... 3 bores with zero compression!!!!!!!!!!! means you are probably looking for another motor!

 

[triplehooked]

Yep, that's exactly what I was thinking....

 

[bob johnson]

pop the head and just take a look.....your either going to see destruction on the pistons or no O-rings at all....hope for the later!

 

[triplehooked]

The latter would be amazing, but not my kinda luck...lol. On the upside, I did find a 175 intruder with 110# compression across the board for $2000..... Just planning for Murphy's law.... Thanks everyone for the input. I'll update the post when I find the results later this week.

 

[bob johnson]

what year is the intruder????? the intruder and fasts trike were said to really be running about 190 hp on the 175's.... as opposed to the other 60 degree looper v6s in 150 and 175... (ocean runners and ocean pros ect) I see thjose motors going for $3500 all the time!...... though.... the devil is in the details! ha ha

 

[triplehooked]

It's a 93 or a 94, cannot remember which offhand. Looked it up by model # a couple of years ago and it said 168hp, obviously that wasn't set in stone. What it was actually putting to the prop I assume varies from eng. to eng. but I heard there was a big to do with the Merc guys running against them back in the 90's due to the 150hp limit on tourneys. All I know for certain is that it ran well up to last Saturday..... Just broke the news to the wife. I may just look for a walleye boat and make this one a full on restoration project if the motor is toast. It has some sentimental value.

 

[racerone]

After storage I recommend mixing 50:1 on the first tank.----Mark oil tank level...------Run some fuel through , say 10 gallons.----Then see how much oil has to be added to the VRO tank to get back to the marked level.

 

[triplehooked]

I tried to upload pics for the fun factor, but they won't upload, so here's the conclusion. The bottom piston has a hole in it, middle piston has chips out of it and rings are gone, top one is still together, but not looking good. So that being said... How much are these buggers to rebuild? Can you just swap out the powerheads on them? Asking for a friend....lol. I would speculate that the oiling system failed, possibly just on one bank if that is possible. It looks like many rebuilders disable that and pre-mix to avoid this.... Again, thanks for any advice...

 

[flyingscott]

You oil injection did not fail. Rebuilding depends on if you do it yourself or not. You won't know how much until you tear the motor down the rest of the way. Sounds like the motor was overheated or ran lean at one time. You need to make sure you have a rebuildable block. Check for the casting flaw in the #1 cylinder.

 

[racerone]

It was damaged when you got it.-----Oil injection failure would wipe out all 6.-----$$$ depends on how you approach the repairs.----Rebuilt powerhead from a reliable source is the best option in this case-----Amazing how well these motors run with that much damage.----Amazing how persistent some folks are in taking it for another trip instead of getting it looked at.-----You have to find the cause or a rebuild will go " boom " again.----Crowley marine----is one place to price a rebuild or even this site.

 

[triplehooked]

Thanks guys for the reply.

raceone... That would probably explain why it never had a decent hole shot. I thought it was the prop. I gather that the oil injection is a all or none scenario? I will have to do some reading up about the injection on these engines. I'll take a peek at the other bank to see if there is any damage. Either way, it will need a rebuild or a rebuilt powerhead. Thank you for the Crowley reference. I'll give them a shout.

flyingscott... Again, all or none on the oiling situation? I'm thinking you are right, either overheated or leaned out at one time. What is the casting flaw on #1 cylinder? I tried to look up issues with this engine and cannot find the reference... I know it would need sleeves, these ones are scored pretty bad. Thanks again.

 

[flyingscott]

The VRO/OMS system is VERY misunderstood. They are typically not all or nothing systems. When they fail they tend to start over oiling the motor not under. They are very simple systems. There is a lot of misinformation about the VRO systems. It seems to be the scapegoat for a lot of problems it Does not cause. The casting flaw will be on the #1 cylinder If you need sleeves it may be cheaper finding a different motor. Once you get it apart take it to a knowledgeable Dealer to inspect the block. You may be able to bore the block it will be hard to tell as I suspect you have a lot of aluminum transfer. If you rebuild it i would convert your vro to a pre-mix unless you replace the pump itself and the sending unit in the tank.

 

[bob johnson]

https://forums.iboats.com/forum/eng...679832-94-johnson-150-faststrike-block-repair if you are looking to rebuild, have the block pressure tested to make sure you dont have one of the 25% of all blocks made with the weak casting line... the guy who checks them can also rebuild the power head...... I did some musical power heads on two motors i have... they interchange easily

 

[triplehooked]

Thanks again for the info. guys. I priced a powerhead at Crowleys for around $3k. A rebuild kit for that engine is around $1200, plus shipping, machining and inspection of the block, sleeves, sealants, cleaner, engine stand, etc... I'm sure I'd be over $2k rebuilding it myself. Might as well go with someone who warranties it and does it everyday.... Figured I'll save my pennies and tear it down for a new paint job and upholstery while I'm at it.

I did have a 1978 Merc. 900 (90hp) given to me in hopes of swapping during the rebuilt. But the controls probably aren't interchangeable.

 

[bob johnson]

changing controls is easier than tearing down a power head!!!!!!!!!!!!!!