1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

[TYLER HUNN]

Hello, I have been reading in this forum for about a week now. lots of good info. I have a 1991 Bayliner Capri with a 90hp Force inboard. It's an L Drive.

Its actually my friends boat and im helping him get it going. After like 3 other people came to work on it with no luck i finally got it running. All I did was take the carbs out and detail clean them. I hooked them back up and got the engine running. It runs rough.

If I rev up the engine a little it smooths out with an occasional misfire. But still doesn't sound right.

I tested the compression in all three cylinders:
#1 125psi
#2 55psi
#3 90psi

I looked up what it's supposed to be and it looks like all three cylinders are supposed to have 145 psi in great condition.

I am now thinking it's the rings or the head gasket causing this.

I squirted oil in the cylinders to see if the compression would increase with some thick oil on the rings. I checked the compression again and it did not change.
This suggests to me that it would be the head gasket and not the rings but I am not a mechanic.

I decided to take the boat for a test run yesterday. I got it running. It didnt want to start but if I hold the throttle open a hair at the engine with someone starting it I can get it going. Then it idles. Really rough though.

We had problems with it not wanting to go in gear. After searching for the problem i fixed it by taking the assembly apart and found the linkage was weird.

I got it going and it kept wanting to die. I found a spot where it ran good at about 1800 rpm. If I rev up any higher the engine will try to die. It seems like the engine is revd up high but it has no power. I can see the water flowing out of the impeller area but the thing keeps overheating. I ordered a head gasket. It should be here by wednesday. Any Ideas?????

 

[pnwboat]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

When you take the head off, take a close look at the cylinder walls and and signs of damage to the pistons. If the head gasket doesn't solve the compression problem, then worse case scenario, you may be looking at boring cylinders and replacing pistons and rings. Best case scenario, replacing rings, or maybe free up seized rings with some Seafoam or similar decarb product. These motors do not take well to overheating.

 

[john from md]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

Change the head gasket for sure if for no other reason than you don't know when it was last replaced. Be careful with the bolts and turn them slowly so you don't snap one off.

You should be getting 5000 to 5500 rpm using a 17 or 19 pitch prop.

John

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

Thank you for the info. I have read alot of other posts about this and hopefully I will be able to help others learn as well as myself ubderstand these issues the force motors have been having. I will let everyone know whats happening as im doing it so just keep an eye on here. Thanks

-Tyler

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

I took the head off and sure enough was a big hole going from the middle cylinder to the lower cylinder on the head gasket. i think this was causing the low compression in the two lower cylinders. a small piece of the gasket, actually part of the metal ring on the gasket surrounding the cylinder broke. It put a couple marks on the top of the cylinder and in the roof of the head in the middle cylinder area. I have it ordered so im still waiting for the gasket to come but this looks to be all thats wrong. the cylinder walls are a little scored but its feels smotth on my finger. I actually nhow realize the middle cylinder was not firing and filling with water while we were running it in our test run. sooo thats it so far ill keep you all informed on the next steps. thanks

 

[john from md]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

Take a file or wet or dry paper and make the marks smooth on the piston and head so you don't get a hot spot. Also, use 400 wet or dry paper, If you don't have a hone, and clean up the top of the cylinder. They tend to get a ridge there.

John

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

thanks john. When I get the head gasket I will take some very fine paper and try to smoothe the small rough spots. It is only in the middle cylinder. Its smooth but you can visually see the rough spots. I am on photo bucket right now and i would like to show you guys what it looked like so all future people viewing can see it and learn from this. keep in mind his mechanic said to him hes 95 percent sure his engine is shot and wanted quite a bitt of money to fix it. then comes along rusty tyler not really a mechanic and finds the problem. man.. all i know is what they taught me in 11th grade small engine class. basic knowledge of how engines work well anywayz. heres the links to see the boat, boat motor, and the head gasket damage.

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00226-20100505-1725.jpg (Head Gasket)

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00225-20100505-1725-1.jpg (Head Gasket)

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00224-20100505-1725.jpg (Head Gasket)

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00207-20100502-1432.jpg (Boat Engine)

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00225-20100505-1725.jpg (Head Gasket)

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00201-20100502-1251.jpg ( My buddies on the boat. I'm taking the pic) our test run lol

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00192-20100502-1153.jpg (1991 Bayliner Capri)

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00206-20100502-1316-1.jpg (He jumped in and it was friggen cold. climbed right back on board. Our test run)

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00165-20100426-1603.jpg ( Engine Testing compression )

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00171-20100426-1604.jpg ( Engine )

* http://i40.photobucket.com/albums/e239/hunntyl2000/IMG00175-20100426-1643.jpg ( Engine )

Thank you all for the help. When the head gasket comes i will take more pictures maybe a video of it running great. damn im gettin too excited. lmao

 

[john from md]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

The L drive series was short lived. There are a few guys on here that have them so, if you need parts, put L drive in your title and they will no doubt chime in. They have some particulars that the outboards don't have.

John

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

Hi, I have one more question real quick. Do I put any gasket sealer on this head gasket before i put it back together or do i just clean both sides up real good and torque down to specs.

 

[john from md]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

No gasket sealer on the head gasket! As for the bolts, I coat mine with blue rtv and it serves as a lubricant for torquing and keeps corrosion from the threads and the bolts. If you have a thread tap, it is always good to chase the threads and blow them out with air before installing the bolts and new gasket.

I have never had any corrosion issues doing this way. I have had problems with anti sieze compound and no longer recommend it.

John

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

dang this head gasket still isnt here. I ordered it 10 days ago and it still isnt even registered at the post office. outdoor network says it is shipped and gave me a tracking number but when i look it up it says the post office hasnt recieved it yet. im impatient lol i wanna be on the boat.

 

[swick]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

I'm waiting to hear how your compression/ performance imporves once you install the new head gasket. Did you purchase it here on iboats? I think I'm going to pull my head off and inspect it too, about $30 for the gasket here, I haven't found it cheaper anywhere else.

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

The gasket came last night and i put the new gasket on and torqued down. took it out for a test run today on saturday and it was running good. we got it up to about 31 or 32 mph. but it wasnt running at its wide open throttle or WOT. I'm wondering what its supposed to be for a 90hp force l drive. We couldnt get it to go over 4000 rpm's. I think its supposed to be at 5500 or so. i think we have a 19 pitch prop on here but does anyone have any suggestions. ??


#1 = 125 psi
#2 = 125 psi
#3 = 125 psi

give or take a 5psi in each.

I'm still gonna do a full decarb.

im wondering if i put like an 18 pitch on here would it let the engine WOT, or run around 5000 rpm.

i purchased the gasket from outdoornetwork. it was about 38 dollars with shipping and took about 13 days to get to my house from the time i ordered it.

 

[john from md]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

Your engine should produce 5000 to 5500 RPM with a 13x19 prop. Changing the prop to a 17 pitch will give you about 400 more rpm. If you can your compression up, I believe you will start seeing an rpm increase. Low compressio = low power.

There is also one other possibility. The foam under the floorboards may be saturated with water. I suggest that you take it to a junkyard or some other place that has a scale and get it weighed. You can allow @450 for a single axle trailer and get the boat and engine weights from NADA.

If the boat is waterlogged, you will never get maximum speed out of it with the existing engine. More than likely, 90hp is the max on the capacity plate so you will have to live with the 32 MPH or pull the floor and clean out the foam.

John

 

[swick]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

Great to hear that you evened out the compression. My 120 only gets up to about 40MPH but thats with wacky compression, and its more than likely the head gasket as well (hopefully). Its also about a 1200 lb boat. At any rate, 32 MPH isn't too bad, take her easy and your on the water again! I guess you are sure that your guages are all working properly?

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

yeah i think the gauges are pretty accurate. I am not finished yet. Next im gonna decarb the engine with some seafoam and run that through the vaccuum lines and run a lil through the gas. After that im gonna test the compression and see if it gets higher. then im going to get new spark plugs. then im gonna tweak the carbs ( still dont know how. any ideas maybe ) I think the last owner might of adjusted them wrong. it looks like some of the screws are more turns than others. I have a question. If the shift linkage is funky and i have to wiggle it to go in gear would this cause the timing not to advance all the way. just a thought. i just notice when at 4000 rpm the throttle is wide open on the carbs. I tried to open up more by hand but it was as far as it would go. It takes a long time to plane out but it does eventually. Tomorrow we are also going to take a look at the lower unit where the prop connects. We noticed the oil drain screw was loose and when we tried to tighten it was stripped. Also looks like the oil was mixed with water. I dont think thats normal . Im gonna drain it and wrap the screw it plumbers tape and screw it back in. then fill it with new gear oil. If thats even what it is. i dunno. LOL. Im hoping the reason the gear jumps and rattles before it actually engages isnt caused by damage runnin with low or no gear oil. Im hoping its just the cable that needs adjusting. um thats it ill keep everyone informed. my goal is at least 40 mph. i be satisfied. Any suggestions just feel free to let me know. oh and im gonna try to put a you tube video link on here of it running weird and it wont do th WOT. Whats the boat suppose to weigh empty? I will weigh the trailer, the truck and then the boat at the junk yard soon. could be water maybe. It seems heavy but i have no reference so its just a hunch. thanks

 

[swick]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

Check here for details on your specific model: http://www.nadaguides.com/default.a...&p=38&f=5694&gc=MR&gtc=MR&m=10180&y=1991&ml=B

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

ok ive noticed the oil for the transum is leaking. it is kinda milky. it was leaking from the drain screw cuz it was loose. im gonna drain the whole thing and put all new oil in there but i dont know what kind to put in the transum. im also gonna wrap the screw in thread tape to prevent it from getting loose again. What oil do I put in the transum and how much. thank you oh and im taking it out this weekend with my video camera so ill have a vid on here by sunday. or a link to one.

 

[TYLER HUNN]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

here is a link to a short video i made today. we had a problem today with the drain screw falling completely out while we were cruisin. we didnt notice it till we took the boat out of the water. we did drive it for like twenty minutes with water getting in the gear area behind the prop. we are draining it completely and going to refill and put a new screw in the hole. hopefully we can find one at the hardware store.


http://www.youtube.com/watch?v=_HlqgwJz4c4

 

[swick]

Re: 1991 Bayliner Capri, 90hp force. No power, overheating, and Bogs out?

Looks like you got it running pretty good now, almost 40 mph. My boat is very similar in size and shape, mine is a 17'. I actually got my new head gasket in the mail today, going to open it up soon and see what it looks like inside.

As far as the oil plug goes, I'm not sure if you will find one in a hardware store, but its worth a try. Make sure you didn't strip the hole in the lower unit, otherwise try and tap it, if you can find a tap that size, or a matching tap and screw slightly bigger. I didn't think teflon tape was going to help much. Water & oil in an engine always turns milky, thats a sign that something is wrong. In a car it means blown head gasket, boat motors are a bit different.