Loud ping when putting back from forward to neutral

[MickLovin]

I took my 100HP outboard out for a water test after putting the new TC carbs on it. when I would idle back and then go to neutral it would let out a loud ping once, I would put it back to forward then back to neutral and a ping, but not every time.
The motor did its hole shot fine and was running well, could my timing be out I am pretty sure it is 32 Deg. as I did it last time via a voltmeter and tightened up till I could get a no volt from 12 volt reading when hit the belt.
Please anyone help

 

[Big Fish Billy]

Re: Loud ping when putting back from forward to neutral

How long since you decarbed the engine?

 

[Frank Acampora]

Re: Loud ping when putting back from forward to neutral

That one has me stumped. Is it possible for you to post a video? If it is only happening when you pull back from forward to neutral, I would suspect something mechanical--perhaps the shift linkage.

 

[MickLovin]

Re: Loud ping when putting back from forward to neutral

I am thinking of the shift linkage to as I changed my controls over to the original Chrysler cables and this is when it started happening, might have to adjust the cable, but the weird thing is with it, it doesn't always happen straight away either, most times it does but on the odd occasion it happens a second or two later. I will check linkages and see where forward is on the linkage at the front, it may be to much in forward and not releasing enough when shifted to neutral and hitting the gear when shifted back to neutral?
In reply toBigFishBilly, I did actually have some carbon deposits on my spark plugs, but don't think this is the reason as what Frank said it did sound mechanical and I have changed the cables, so they might need more adjustment.

I also noticed when I put the 21 pitch from the 23 pitch prop that I gained around 500rpm, but I am unsure if I have my Tach set right now, it has a setting for a 12 pole @6oooRPM = a setting of 6 so I set it to 5.5 as for a 12 pole @ 4000rpm it would set at 4 . Does this sound right?

 

[Frank Acampora]

Re: Loud ping when putting back from forward to neutral

Just thinking: Check the shift cable where it is secured in the clamp at the engine. If the clamp is loose, the cable can shift inside it and when brought back into neutral (because the throttle is spring-loaded) it will snap back--maybe with a noise.---just thinking. In fact, it could even be the throttle cable. Check both.

Dropping down 2 pitches will give approximately 400- 500 rpm increase.

As far as the tach, I have never seen one like you describe but your reasoning sounds correct. I needed to read it a couple of times before I understood though.

 

[oldboat1]

Re: Loud ping when putting back from forward to neutral

makes sense to think there is an issue with the shift cable, as the sound started when that was replaced. If you disconnect the cable at the motor and shift manually at the motor, does the noise still occur? Maybe with the cable disconnected at the motor, you can physically compare the location of the cable connector (neutral position at the box), with respect to the motor shift lever in the neutral postion. That is, the cable end might be adjusted slightly off the neutral spot.

that was awful to describe. sorry. It sounds like you might be missing the neutral sweet spot with the remote cable.

(curious -- going back to Morse cables? What is the change?)

 

[MickLovin]

Re: Loud ping when putting back from forward to neutral

Ok I found what it was, after doing the cables and actually finding it a bit loose where the pivot is, I tightened it up. started the motor and still same thing, scratching my head I took of the cowl and watch it when it made the noise this time from the main chair where my ignition switch is, when I started it I noticed the starter motor running still, the stupid ignition switch is ticking a bit between run and start and keeping the starter in, NO wonder my Volt meter was reading low on the water, I thought that was another issue. So I am pretty sure after restarting it and not getting the noise after adjusting the start switch manually back a bit, that I have fixed it, I am thinking the starter has hit the flywheel when I have put it back to neutral, as it doesn't always do it and can do it after being in neutral for a few seconds. I tried it another 4 - 5 times and it didn't do it again. I am confident, but to be sure I am letting it cool and doing it again this afternoon, so I will post you on it. thanks for your help.

 

[MickLovin]

Re: Loud ping when putting back from forward to neutral

Defiinately fixed it

 

[MickLovin]

Ignition key switch maintenance question

Ignition key switch maintenance question

Hi guys, Just thought I would give you an update of the problem I had come across. I was getting a ping when I went down to neutral from forward also a low voltage reading on my fish-finder, but the low voltage reading only came up when I was at idle.

I played with the gear cables and lever and found the actual lever loose, started it up went to forward and then reverse still one big ping. (THEN I NOTICED IT) The starter was still running so I went to the ignition switch and noticed it had not fully sprung back and was sitting in the start position slightly, enough to keep the starter engaged. As I went to switch it it went back to run with little movement and seems to be stuck right at the end of the start to run position, you turn it about an 1/8 if that to get the starter to disengage.

Ok question please! I am an electrician and was wondering if squirting some contact spray would help release the spring more to stop it from sticking?

 

[oldboat1]

Re: Loud ping when putting back from forward to neutral

that's good sleuthing. maybe some electrical cleaner sprayed in the key switch?

 

[Jiggz]

Re: Low voltage on hummingbird and loud ping with Chrysler motor - resolved

Re: Low voltage on hummingbird and loud ping with Chrysler motor - resolved

Actually a part of the regular maintenance is to apply a film of grease or oil on the starter shaft and also to the pinion gear. Most causes of pinion gear getting stuck in the up position is weakened spring, improperly set stop nut and sticky shaft.

 

[MickLovin]

Re: Loud ping when putting back from forward to neutral

It wasn't getting stuck the ignition switch was getting stuck holding the starter in, it was a little click on the switch and it stopped. Yea that's what I am thinking of oldboat1 non conductive

 

[MickLovin]

Re: Loud ping when putting back from forward to neutral

Ok this is the loud ping on video, after correcting the ignition switch it stopped, but when I rev up and then back, I am getting a rattle after it, like it is missing but not a miss as I am decelerating. Sorry about the video picture, it is done on a iphone with what looks like a dirty screen :grumpy:[video]https://plus.google.com/u/0/photos/117187063357895465410/albums/5979338577261600849/5979338577885471202[/video]

 

[oldboat1]

Re: Loud ping when putting back from forward to neutral

interesting. It sounds to me like a linkage rattle of some kind. (no pic, just sound -- which might even be better.) It's pretty slight. Was it recorded with the cover on or off? (actually, maybe it's the cover latch -- on the front, right? could rattle with the cover on or off. if with the cover on, might need to be tightened up.)

 

[MickLovin]

Re: Loud ping when putting back from forward to neutral

I know what the loud ping was, but I don't know what the slight rattling noise when I decelerate

 

[oldboat1]

Re: Loud ping when putting back from forward to neutral

linkage, Mick. some kind of linkage rattle or similar. See above.

 

[MickLovin]

Re: Loud ping when putting back from forward to neutral

which linkage oldboat1?

 

[Frank Acampora]

Re: Loud ping when putting back from forward to neutral

Check for a weak return spring on the starter. Sometimes when decelerating the bendix will bounce--not necessarily hitting the flywheel--but bounce on the shaft causing a rattle. Look at it with the cover off.

 

[pnwboat]

Re: Loud ping when putting back from forward to neutral

Hard to say where that noise is coming from. Can you isolate it more while standing next to the motor with the cover off and someone else working the throttle?

Maybe try disconnecting the throttle linkage from the cable and working the throttle cam by hand?

 

[MickLovin]

Re: Loud ping when putting back from forward to neutral

Ill try that and get back with another vid thx, and Frank the loud ping was the starter still running, as soon as I switch the ignition switch to it's correct position it doesn't do it