1985ish Black Max 150 Issues

devonboy

Cadet
Joined
Aug 25, 2010
Messages
15
So we bought this boat a few weeks ago and I have asked various questions about the boat, but now, having had a few runs, I have a bit mroe detail about it and a few mroe in depth questions.

We have had all the carbs off and given the engine a good going over, all in all it seems very clean.

1: Oil
While the engine is running, an intermittant beep is constantly sounding which began when the oil ran low, which i presumed was the low oil sensor.
refilled the oil and the beeping has not stopped. Is this likely to be the sensor itself?

After an hours run, all fine, we trimmed the engine up to go over a shallow patch and oil began dripping out of the engine cowelling, so we killed it and took the cover off. It seemed to be coming out from the cap in the tank inside the engine and from the seal around the pipe feeding in.
If the seals need replacing, could this be the problem with beeping? would lack of oil pressure in the tank inside the engine cause the beeping even though the exterior oil tank was pressurised?

2: Batteries
Having had the first run,we turned off the isolator on both batteries (one dual switch) and left the boat on the trailer
when we came to use it a week later, both batteries were dead.
It has a small 100AH battery (presumed starting battery)
and a larger 80AH battery (presumed leisure battery)
we took the smaller one home and charged it overnight and it had enough juice to start the engine.
we ran it for an hour with the isolator turned to the larger battery to try and charge it.
We then left it on a pontoon for 2 hours, arrived back and put the isolator onto both batteries to start and nothing, then tried on the smaller battery and nothing again.
So ended up jump starting it.
The batteries are fairly new.
Would running it for an hour give it enough charge to start the engine or have i got an alternator problem?


Thanks

Sam
 

hkeiner

Lieutenant Junior Grade
Joined
Oct 17, 2006
Messages
1,055
Re: 1985ish Black Max 150 Issues

Regarding the oil , the small tank under the cowel needs to be full and tightly capped. The sensor inside that tank will cause a beep if the tank is not full (or if the sensor/magnet is defective). The attached link provides a pretty good overview of how the oil injection system works.

http://continuouswave.com/whaler/reference/mercuryOilInjection.html

Regarding the batteries, your best bet is to troubleshoot the charging system using a multi-meter to see if the output from the charging system is OK. You can also check if there is excessive parasitic drain on the battery while the motor is off. I personally always disconnect the battery on my boat when I am not using it for more than one day or so.

The below linked guide may also help.

http://dolphinmarineservice.homestead.com/Ele4.html
 

devonboy

Cadet
Joined
Aug 25, 2010
Messages
15
Re: 1985ish Black Max 150 Issues

thankyou, very helpful, i'll be checking it all out on the weekend
 
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