losing spark after running under load 20 minutes

[Shorebum]

I have a 2000 130 hp ocean pro. After making a 20 minute run yesterday motor cut dead off. No spark would not restart. 2 hours later started right up. This morning did the same thing after about a 20 minute run, 4 hours later started up on the muffs and ran well. Any ideas, powerpack? stator? BTW no wierd readings on the tach

 

[HighTrim]

Re: losing spark after running under load 20 minutes

Sounds like an ignition component is heating up and failing.

Try using a hair dryer on one component at a time to mimic running 20 minutes.

 

[Shorebum]

Re: losing spark after running under load 20 minutes

Good idea. Any thoughts on it being the emergency stop circuit since spark is lost to all cylinders.

 

[Scottycat]

Re: losing spark after running under load 20 minutes

when you are on the muffs, you are forcing cold water through the motor, the motor will never reach operating temp, never.

When you run in the water your motor works to get the coolant through, it is reaching operating temp and maybe a little too hot if the impeller isn't getting enough through the motor.

I think there is a timer test for how much water it pumps in a minute at idle, check your manual.

If it's ok, then you have a faulty e-stop sensor , again there is a test for this in your manual.

 

[Rscardina]

Re: losing spark after running under load 20 minutes

Good idea. Any thoughts on it being the emergency stop circuit since spark is lost to all cylinders.

my suggestion.. take it out..not too far. run for 20 minutes..if she cuts out and you lose spark on ALL then remove cowel, and disonnect the red harnes plug. jump the starter solenoid (bring some wire) and see if she fies.. if she does, then your kill circuit is shorting somewhere. if she doesnt, then you may have overheat issues which, i hate to say, can be dificult to track.

make sure your t'stats are good and clean and working..

if your engine has over temp issues, and I could be wrong, I thought you only lost one bank not all.. your manual should tell you that for sure

as mentioned..components heat up and fail..trick is to catch it hapening.

 

[Shorebum]

Re: losing spark after running under load 20 minutes

I replaced thermostats this year and from what I could see the motor is relatively free of scale. No overheat warnings and checked system to make sure it is working. It is appearing that I will need to get the motor to fail again in order to test the different components. At trolling speed yesterday no issues with overheating problem occurred on way back at 4000 rpm.

Would an ittermittent short in the stator cause this or is it more likely powerpack?

 

[Shorebum]

Re: losing spark after running under load 20 minutes

I am not sure which red harness plug is being referred to. Are you saying take the key switch out of the circuit or can I just raise the power pack up and disconnect the black/yellow kill switch wire and accomplish same thing.

When I had this problem today we iced the power pack down right after cutoff and it did no good. Several hours later, long after the engine was cool it started right up.

 

[Rscardina]

Re: losing spark after running under load 20 minutes

By red harness I meant the bundle of wires that comes from the ignition key and mates to the engine.. mine is a big red plug that has male and female ends that mate up.

effectively, yes, i'm saying make sure its not something simple in the key circuit that is casuing the issue..bad connections moving around when underway..wires heating or shorting the kill. I had an issue with my engine, cutting out as if you just turned the key to off.. turns out my key switch was shorting to the kill. it happened infrequently so it was hard to find until It happened in front of me..

I asked about the stats becasue some engines sensors are tied in to drop a bank so your engine doesnt completely overheat. almost like half power to get you back in..

the stator could be an issue since its what provides the power to the powerpack. coils are also a cause of failure at higher temps as well..but you should see spark elsewhere...so i wouldnt go chasing coils just yet becasue your problem seems highr in the circuit

the issue is you say you have NO spark anywhere when she dies...so to me, it appears she is either shorting to the kill, or componets overtemp is causing issues...stator, but i cant say for sure becasue i do not know that motor well..

 

[Shorebum]

Re: losing spark after running under load 20 minutes

OK ran the boat the watermuffs for half hour couldn't get the failure, big surprise. Went ahead and used a spark tester set to 7/16" to check spark also and it was good and strong on all cylinders. removed key switch looked for obvious failure signs of shorts or overheating could not find any. Looked closely at all engine wiring for obvious signs and nothing. Any resistance tests for the key switch?

I know the rectifier is part of charging system could it cause this problem. The TACH is not going crazy so I did not consider.

I still lean toward guess of power pack failure on the e-stop circuit.

Thoughts?

 

[ssmyth]

Re: losing spark after running under load 20 minutes

i had the same thing happpen on my 90 HP. it was the power pack failing when it reached a certain temp. took it to a shop and they had a hard time diagnosing until they put it in a tank and ran for awhile to get it to fail.
all is good now, but my wallet is a lot thinner.