OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

[silverfox441]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Good to hear! You know, you and i are in the same Boat (wink wink) i have the same set-up (but mine is older) did about the same work on the motor and had the boat going 42 mp/h (though with a 17 pitch prop). I'm taking my family tomorow on the Frazer River, but it's only gonna be like 20c. The coldest summer in Vancouver in decades.
Have fun!

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Well I spoke to soon! Dropped her in the water today and I guess after she Had the chance to get warm and then cool down for the first time since the overheat...the gaskets separated on the back exhaust manifold and were seeping water.

I am off from work Wednesday through Friday this week so I will tackle this job on Wednesday...I already have the gaskets.

Hopefully I can do this without having to pull the powerhead out of the boat.

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Looks like I can get the exhaust cover and manifold off if I take the heads back off. I have another set of head gaskets so that is no big deal. Anyone have any experience with removing the exhaust cover and manifold from the back of the block without taking the powerhead out of the boat?

 

[boobie]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Tried it once, gave up and pulled the p/h. With the p/h out it's eaiser to work on and you can put things back correctly.

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

I figurd it would be about 1000x easier to work on it with it out of the boat, but getting the ability/tools to get it out of the boat may be a tough one. I really think I can get to everything if I take the heads back off. We will see.

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Yesterday I took off the back exhaust manifold cover and manifold without taking out the engine. Took the coils off the heads, removed some hoses and removed the back deck cover completely from the boat. Worked like a charm! Cleaned everything up, inspected for more damage and fixed a few tiny things here and there that were on my to-do list.

I decided to go ahead and replace the thermostats and valve body gaskets while I had everything apart. Those parts come in today so I will button her back up later and hope for the best!

Wish me luck

 

[AlTn]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

hope you can post pics of this stuff as it will certainly help someone "down the line" when they find your post one day...oh yeah..best of luck

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Well today we got everything put back together and gave her a test on the water. Water started leaking out of the valve body gaskets I just replaced so I tightened up the bolt a little more and that fixed that issue.

Ran her up and down the lake for about 15 minutes mostly at WOT other than idling in the no wake zone. All was good! The block was hot, you couldn't leave your hand on it but no hotter than I know a car engine can get.

During this process I never thought to take pictures. I worked on this engine with it in the boat out in my front drive way. I could take pictures of the cuts and ever lasting grease stains I have on my hands and arms .

 

[AlTn]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

they say it gets better, they just don't say when...enjoy the rest of the season

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

I beleive I also have a bad stator. Yesterday it started dieing on me at idle, it would start right back up though. WOT it does fine, no issues. After it died the third time I tried to crank it again and it wouldn't crank... the battery was dead. I charged the battery and went back out......everthing was fine..except it will stall out at idle once and again.

Any thoughts?

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

bump

 

[AlTn]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

couple of things to try....check battery voltage before starting and while running...should show an increase....use an inductive timing light on each plugwire after it stalls < better yet, when it starts to stall..hard to catch at that exact point tho'> looking at the flash, is it there..is it bright and steady?..dim and sporadic?...just trying to determine if it's an ignition or fuel delivery issue...post back

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Ok, so I replaced the rectifier/regulator and stator on Friday. So to re-cap, this is what I have done:

- Replaced: Starter, Power Pack, 4 Coils, Rectifier/Regulator, Stator, Spark Plugs, Head Gaskets, Head Cover Gaskets, Exhaust Manifold Gaskets, Valve Body Assembly Gaskets, and thermostats.

I took the boat out on Saturday, RPM Gauge still not working. Ran at WOT for about 6 minutes and the boat dies at full throttle... no warning signs at all. Just WOT and then the engine shuts down. Of course, it wouldn't start back up. I pull a plug out and test, it is getting good spark!! Still won't start.

So we w pulled the boat out, take it back to the camp site and about 20 minutes later tried starting it. Boom! Started just fine! So, on Sunday we do it again but this time had it at WOT for about 15 minutes before it died completely. Then 15-20 minutes later....it starts back up.

Since I am getting spark, even after it dies, to me it has to be fuel related. Please keep in mind I don't have the manual priming bulb anymore. The previous owner took it out and had some electric pump put in where when you turn the key you can hear it pump and you can push in the key to push gas into the carbs.

Any ideas on what this could be now? Could I be getting water in the cylinders shutting down the engine or could it be flooding the engine with fuel or losing fuel?

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Just put it back in the water and started it. Noticed the water pressure gauage PSI was 0 at idle and at WOT was only about 4-5psi. Looked at the engine and wow.... I have water leaking out of the valve body assembly where the thermostats and springs are. I replaced those gaskets and thermostats originally, but it is leaking between the gaskets. The bolts are tight enough.... no clue why it is leaking there.

So I am thinking it is starting to overheat where the water flow isn't good enough and then it shutsdown.

Guess it is time to finally pull this engine out and take all that apart again, ensure it is level and put it back together again with new gaskets.

Any input or suggestions is appreciated.

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Dropped it in the water again just to be sure and I found I was being misled. It seems the water was leaking out of the bottom of the head gasket and dripping down across the valve assembly.

Brought it home and discovered two loose head bolts. I tightened them back to 20 ft lbs and I will try it again tomorrow.

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

OK, I took it to the ramp again and discovered my starter was jammed up! What is going on here??

Luckily the starter is less than 40 days old so they are sending me a new one at no cost. I went ahead and ordered the flush kit so I can start working on this and starting it up at home rather than making multiple trips to the ramp all the time.

Should have the flush kit and new starter tomorrow. We will see what happens from there.

Any input would be greatly apprecaited!!

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Well everyone... I put the new starter in and did the flush. I just could not keep the thing running at idle still!!! Then the engine just died on me again, at this point I became very frustrated!

The previous owner had someone install an electric fuel pump in place of the factory bulb/vacuum pump and primer solenoid. The authorized BRP Dealer I took it too said it was installed well and was compliant with legal standards...so I left it alone.

What did I notice? The pump wasn't pumping! So I grab a new electric fuel pump and install it. What do you know, it starts better and runs at idle without stalling!!! Seems I have been working with a failing fuel pump and it has just been gradually getting worse until it died yesterday.

So it seems all is good! I took an IR Thermometer and the engine stayed around 145-155 deg F. Let's hope no more issues pop up on me and I can just enjoy the rest of the warm weather for the season on the water and not in the engine compartment!

 

[AlTn]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

hope so too....best of luck

 

[tmfeaster]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Ran it today for a little over an hour....mostly at full throttle down and back up the river.

Everything went good! Started great, ran great, never died, started back up when I would turn it off. Checked the engine temp with the IR thermometer and the right side was at 209 and the left at 217.

Is that too hot? Water runs through the engine fine when I have the garden hose attached.

 

[Dags]

Re: OMC Crossflow v4 115hp Turbojet - Overheated/Ignition and Head Problems

Yes, too hot. At idle, should be around 130-140 depending on the fresh water temp... when running, no higher then 160 is from what I've been reading. The alarm shoould have tripped at around 206 or so.