Still need HELP OX66 225

[channelsurfer]

Fixed the overheating prob.**** NEW PROBLEM****<br />I ran offshore today approx 30 miles no prob. When I got there we trolled at 500 rpm for about 10 minutes and the motor cut off. Got the motor refired and headed back, it cut off about 5 times on the way back, would just shut right down. Finally about a mile from the dock, it quit and did not want to start. when I finally got it started it sounded like it wasnt running on all cylinders.<br />The only thing I have done since the water pump, thermos and poppet valve is clean the O2 Sensor.<br />One time it just lost power and I was able to throttle back to about 2000 and keep it running, then it picked back up to 4000. the last time I got it running it jumped all around. I had an alarm buzzer when I tryed to crank it. Temp gauge was fine, physically checked motor, not hot. and oil levels were all fine on gauges and visually in tanks.<br /><br />Thanks<br />John NC

 

[rodbolt]

Re: Still need HELP OX66 225

check/replace the pressure relief valve grommet. takes about 20 min maybe on that motor and its part of the routine maint. do all the routine maint as per the hour OR calander and you wont post much, fail and you will see how expensive parts can be. have you done the VST and O2 sensor maint? how about oil level sensor maint and remote tank maint?<br /> but the problem you describe is very common and the grommet is the first place I would check.

 

[channelsurfer]

Re: Still need HELP OX66 225

Rodbolt,<br />I pulled the poppet, there was a couple small pieces of sand that could have been preventing the poppet from closing, but all in all, everything looks very clean. I will purchase a new poppet, grommet and gasket tomorrow, let you know if it solves the prob.<br /> I just bought the boat a month ago, and purchased a Service Manual today, I have the O2 sensor soaking in carb cleaner tonight, along with the tube. The Yamaha service manual is not as clear as I expected it to be, it mostly looks like an IPB to me.<br />Would you mind giving me the details on what to do with the VST and remote tank sensor and anything else I should do? Thus far I have new plugs, lower unit oil, water pump, cleaning O2 sensor, and new thermostats.<br />THANKS FOR ALL YOUR POSTS ON HERE! You really save the working guy some money and time, I have read a lot of your posts, and learn something new everytime. Much appreciated<br />John

 

[rodbolt]

Re: Still need HELP OX66 225

be very careful soaking the O2 sensor. if it dips in past the threads it will most likly contaminate and kill it. the remote tank has a filter that neds to be changed once a year. its a little inline filter between the tank and the pump. the little vynil tube on the engine tank is a water trap/drain. it should be drained every 100 hours and once a year I drain the tank completly with the key on and watch the oil transfer. the book says to remove it for inspection. if you do drain the tank, remove the sensor and screen, RETRIEVE AND DISCARD the rupper seal that seals the nipple to the tank. failure to RETRIVE the seal can result in a trshed motor. on your 225 with the key off and the engine tank drained and the remote tank about half full turn the key on. you should get a steady horn, bilnking bars or arrows on your tach and the transfer pump should run aproximatly 180 seconds or until the tank is full. if after 180 seconds the tank is not at least half full look for a restricted oil line, that part aint in the book. the VST has a filter on the bottom that needs to be serviced at least once per year. it requires removal of the tank assy from the block then the actual tank part from the assy, you DO NOT need to remove any fuel lines. any lines on the high pressure side that you cot the clips on must be replaced with the same type clip, DO NOT USE a regular hose clamp. you need to replace or rebuild the 3 low pressure pumps about every 3 years. check the resistance on the plug caps,they unscrew, once a year. check the white plastic oil link clip for cracking every six months, check the oil pump to stopper clearence once a year as per the service manual.<br /> the cooling system anodes, if they have never been inspected, I would leave alone. if you break it off it requires cyl head removal to access. in fact here in the salt pond I usually cut the pencil part off and just install the sealing part. less problems that way. after that they work great till they break <br /> I do reccomend the correct yamaha service manual and a wink blinky, a TPS and an O2 sensor test harness along with a digital multi meter if your going to do your own maint.

 

[channelsurfer]

Re: Still need HELP OX66 225

RODBOLT,<br />Thanks for the info. I did have the O2 sensor just past the threads, has been sitting about 30 minutes in cleaner.<br />I wish you were in Morehead City, its hard to find a good mech around here.

 

[rodbolt]

Re: Still need HELP OX66 225

its hard to find them here too.<br />on the poppet grommet, make sure you carfully clean the pocket.

 

[channelsurfer]

Re: Still need HELP OX66 225

Rodbolt, <br />replaced the poppet and grommet, had the old style poppet, put a new mushroom head poppet in and everything seems to be working fine. Havent had a chance to water test it yet, but the temp gauge was back to normal running about 10 minutes on the water hose. Seems to be running a little smoother with the cleaned O2 sensor also. Pumps and filters next. Thanks for the Help! <br />John

 

[channelsurfer]

Re: Still need HELP OX66 225

Fixed the overheating prob.**** NEW PROBLEM****<br />I ran offshore today approx 30 miles no prob. When I got there we trolled at 500 rpm for about 10 minutes and the motor cut off. Got the motor refired and headed back, it cut off about 5 times on the way back, would just shut right down. Finally about a mile from the dock, it quit and did not want to start at all. when I finally got it started it sounded like it wasnt running on all cylinders.<br />The only thing I have done since the water pump, thermos and poppet valve is clean the O2 Sensor.<br />One time it just lost power and I was able to throttle back to about 2000 and keep it running, then it picked back up to 4000. the last time I got it running it jumped all around. I had an alarm buzzer when I tryed to crank it. Temp gauge was fine, physically checked motor, not hot. and oil levels were all fine on gauges and visually in tanks.<br /><br />Thanks<br />John NC

 

[rodbolt]

Re: Still need HELP OX66 225

most anything will cause that, from a clogged VST filter to a loose battery cable. if it does not get 12V it shuts down, if fuel pressure drops it suddenly dies, EFI is not like carbs, you wont always get a decrease in power ya sometimes just get a shutdown. the buzzer while cranking may indicate a short in the white wire to ground. if the CDI gets a cranking signal and a kill ciruit signal(grounded white wire) it will set the alarm horn. if ya dont belive it crank the motor with the stop lanyard out. a stop signal will also shut off the fuel pump. an easy check is to monitor the TPS 5V reference voltage or the fuel pump 12v while its running, if your dumping voltage check the stop circuit and the main engine harness, there are some splices in the harness that like to fail.

 

[channelsurfer]

Re: Still need HELP OX66 225

I did notice that the fuel filter was only about 3/4 full when I took the Cowling off. I was running on both batteries when it first died, it seemed like it did not want to crank, so I switched to just the #1 battery and it cranked better. Could not get it to fire right back up, had to let it sit awhile and apply throttle and choke to fire it the last time it quit. the other times it seemed to fire after a couple tries. Is it possible to bypass the kill switch to see if that the prob?

 

[rodbolt]

Re: Still need HELP OX66 225

there is no choke on an EFI motor.<br /> apply to much throttle and the system shuts down. the filter cup being half full is a normal condition not an indicator of anything.

 

[channelsurfer]

Re: Still need HELP OX66 225

I went out to the boat and tried cranking it, got the warning buzzer again, and it wouldnt start. So I unplugged the Lanyard and plugged it back in, it immediately fired up. I unplugged the black and white wire to the kill switch and it is idling fine in the slip. I did also have a loose positive wire on my #2 battery. I should have tried unplugging that kill switch off shore, would have saved me a lot of heart ache. Will it have any effect on the the system if I leave it unplugged? I think my plans are to bring you this boat in the spring for a once over on everything.

 

[rodbolt]

Re: Still need HELP OX66 225

a bad stop swich will definatly shut it down, wont hurt anything to leave it unplugged. a loose battery cable will shut the engine down as well. no 12v and no EFI.

 

[channelsurfer]

Re: Still need HELP OX66 225

Thanks Rodbolt,<br />I idled over to the boat ramp and pulled it out, ran fine at idle. Had enough boat for this week.<br />If you ever come to Morehead City and wanna fish , just drop me a line, would love to have you on board. 23' Contender<br />jkerr@ec.rr.com<br />john

 

[rodbolt]

Re: Still need HELP OX66 225

as funny as it sounds I tend to get seasick on boats. I stick close by in the local waters and then only when its calm . yep, a seasick boat mechanic that does not like the taste of fish <br />aint that a kick ?