115 EFI 4-stroke ran with no oil, now alarm sounds

[twirk]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

cr2k, i will check the overheat sensor too. thanks.

@timestep, what do you mean by a possible water problem?

 

[Timestep]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

@timestep, what do you mean by a possible water problem?


What I said in my post #5 above.

Dave

 

[Faztbullet]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

Parts will interchange but will have to be set to spec's, but why rob parts off a usable engine? Test the Merc and see what it needs and price the parts,if to high sell it or part it out and get another engine.

 

[twirk]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

@timestep: Got it, I didn't catch that you wrote 'impellor' the first time around.

Faztbullet: Right now the Yamaha is not usable. It is lacking electronics (CDI box) and the lower gear assembly. It got stolen, unfortunately. So I dont have a problem swapping the parts (if i am able to).

Will test and get back to the forum here.

Thanks for all the advice guys.

 

[starcraft1982]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

Wow,all these posts and still dont know what alarm is sounding?!Simply put,check compression,oil pressure,and water flow.You HAVE to know what alarm is sounding.You have to know that compression is good/not.Still sounds like youre asking tons of questions but not checking anything or trying to get to the root cause.Compression check is the mandatory first thing.Then go from there.$8 and 10min. isnt too much to find out if your motor is toast.

 

[twirk]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

Again, I will test the engine and get back here with the results.

Thanks for the advice y'all.

 

[twirk]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

Well, finally I got a authorized Merc/Mariner mechanic to come and do a diagnostic test of my outboard engine.

The crankshaft sensor was showing a fault and he said he could hear the engine was knocking. Although he saw no metal slivers in the oil and there was no friction points when he manually turned the flywheel.

The engine has run 850 hours and the crankshaft sensor went on at around 560 hours (perhaps it means it started at 560 hours or maybe it has been on for 560 hours, I am not sure how to read it, and I forgot to ask).

The mechanic says it is probably the crankshaft bearings and perhaps the crankshaft needs to be changed.

We ran the engine for a few seconds at a time, but without water. The alarm did not sound like it had done before and I am thinking it is because the oil level, which was WAY too high (the previous owner put way too much oil in last time), is now back to normal (the mechanic tapped some oil).

So now I am just waiting to hear what its gonna cost to change the crankshaft bearings and perhaps the crankshaft.

 

[twirk]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

Oh i have a question. Because I am considering changing the crankshaft bearings myself, however i do not have the special flywheel removal tool.

Does anyone know if its possible to remove without the special o ring flywheel tool?

 

[Maxz695]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

Alot of varied interesting advise. #1 check the compressoin. Heat without oil expands the internal engine componants. This already shows the componants where subject to large amount of stress. Hense Engine shut down on the salor. Cpmpressoin would be the first check i would make. This was a great instuction on what to look for next from Fastbullet "Cut open the old filter and check for babbit material in filter pleats." If you find this then you gonna find youself not worrying about any alarms until you do some rebuilding. attaempting to put oil in this thing and trying to attempt to run it without finding out what happened is not a very smart thing to do. You are assuming everything is fine (Maybe) and will more than likely do more damage and or scaring to areas already affected by the shutdown.True it may have shut down before any damage was done but, some here say it has this feature some says it does not.whichever is right or wrong could make the difference in minimal to no damage or major damage. You need to do more investigating on this featured componant. If the compression is good then you have to wonder if the pistons are gonna swell up when heated under stress. That would be my concern if the compression checks out well. If you find no signs of babbit then you might just be ok. I,m trying to think of an area you can check for blueing from an overheat but I guess maybe you could find something Just a few thoughts. Hope all works out for you.

 

[Faztbullet]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

Cut your losses and trade it in. The crank if damaged cannot be turned down and is about a grand($1000). The camshafts in cylinder head does not use bearing but ride on a oil film,if bore are damaged the head will need to be replaced or welded and remachined (like the Ford OHV) and that aint cheap. If it ran without oil you will find more than the crank is damaged, oil level also does not effect alarm as it is triggered by oil pressure. This engine should have a minium of 40 psi at idle and about 70 psi at WOT rpm.

 

[ONERCBOATER]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

your merc tech is ok with "
We ran the engine for a few seconds at a time, but without water"?? get a real tech is 1st thought.
second thought is, no offense intended but if you didn't know enough to check oil psi, compression, and impeller operation...and look into manual to find out what the beep code was indicating.... you more than likely do not have the ability/knowledge to disassemble the engine and repair it.
trade it in, sell it, part it out. Or get a mech that doesnt run engine w/o water to give you an estimate for repairs and see if you can stomach the price.

 

[twirk]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

No offence taken ONERCBOATER. Ive worked plenty on my snowmobiles, but have never worked on an outboard motor before. (this will be my first summer as a boat owner).

I will have to ask whether the mechanic is able to do a compression test.

I'll see if I can cut open the oil filter today too, fish around for metal shards.

According all the advise I am, unfortunately leaning toward looking for a new engine. Although I am going to contact the mechanic today to get an estimate of what it will cost to fix the engine.

 

[twirk]

Re: 115 EFI 4-stroke ran with no oil, now alarm sounds

Checked impellor. working fine.

Prepped for a compression test, but found shards of aluminum when doing an oil change (mechanic did not catch that. there goes my trust)

now my next step is to take apart powerhead, replace bearings and crankshaft if needed.

i have been pouring over the service manual so i am well on my way.