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    ??? about reversion

    I dont have any reason to believe I have an issue with water reversion but I was just wondering. If the manifolds and risers are straight up from where the exhaust goes out of the engine then what stops water from going back down into whatever cylinders exhaust valve is still open after...
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    new complete engine with 70 hours 1st overheat.

    So Im pretty sure my engine has a 140 degree t-stat in it because it usually sits right at 145-150. A couple weeks ago I noticed that after running it for a while it was creeping up to 160 or so but would come down if I let off the throttle for a sec. I just bought the boat the end of June and...
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    Someone went on my boat and stole my stuff!!!

    I keep my boat at a marina dry rack and uasually keep it on the water at the dock there for three or four days at a time. There is a locked gate that you have to walk down the side of the marina to get to the docks. There is a half a** fence set up with wire on top but I have locked myself out...
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    Just to make sure. Interchangeable hub install.

    I changed to a new SS prop that takes the interchangeable hub and now I have a vibration. Just to make sure, the interchangeable hub is installed by putting the square piece in the prop cavity, putting the thrust washer on the prop shaft, putting the insert part that has the splines in it in...
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    GREAT new prop. Now vibration?

    So I put the new Apollo prop on yesterday and today I went for a little ride and there is a vibration now from 1300-3200 RPM's. It might be vibrating above 3200RPMs but if it is I cant feel it. The Apollo uses the interchangeable hub. I checked the prop again and it is on there correct and...
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    ESA knock???

    My boat has been running great. Sometimes when i shift into F the esa will stock and i have to jiggle the handle to get it to stop stumbling Well, I changed the impeller and put a new SS Apollo prop on yes. Today I took it out today and notice that the boat now makes a weird almost knocking...
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    Keep spinning hubs

    Hi all, I have a OMC 5.7 with a 1.5:1 Cobra drive. The boat came (when I bought it) with a 15.5 X 15P alum prop. The prop looked pretty dinged up so I planned on getting a new one but first I put the line on the hub and prop to see if the hub is spinning at all. It was. I didnt have any...
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    Delco part number(s)

    Sorry if this is in the wrong section but I have been trying to find some Delco part numbers with no luck. I called Delco from the number on theyre site and the guy told me that Delco stopped making marine parts and that anyone with Delco marine parts for sale is selling old stock. I dont...
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    Changed plugs. Old ones looked ok now new ones look lean.

    I took the Autolite plugs out of my engine and put NGK plugs in. BR6FS which members here said was what to put in so Im sure theyre the right plug. The Autolites looked normal when I took them out. Not rich and not lean. I only have about 10 hours on the new plugs and today I took one out to...
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    How to trace down this problem.

    I barely ever run at night but the two times recently I have run at night I have noticed this problem. Everything I turn on electrically makes my V gauge go down noticeably. If I turn the NAV lights, and guauge lights on my V gauge goes from 14-15 to 12. If I use my trim then it drops to...
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    Do flappers on a thru hull exhaust really keep the water out?

    I have a 25ft Donzi with a 5.7 OMC Cobra with thru prop exhaust. I am thinkng about installing some sort of thru hull exhaust this winter. I have the center style straight back riser, and I have a swim deck. I have saw boats that have the thru hull in kinda the same setup as me. I am gonna...
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    Spark plugs this marine store sold me.

    When I bought my new engine (5.7 OMC) a couple months ago it came with autolite 25 plugs. I have been wanting to change them out to NGK plugs but when I go to NGK's site it shows that I need they're UR4 plug. I havent been able to find these anywhere locally so I have to order them and I...
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    Spark plug wire routing?

    I got my OEM OMC manual today. Its day and night to the crappy Seloc one. I was just looking through it when I saw some charts for trouble shooting problems. One has a part that says Engine vibrations and noises ---IGN ---Improper spark plug wire routing. Maybe its in here but I havent...
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    Where are the most likely places for a 5.7 to leak engine oil?

    I have a new 5.7 engine. It has about 50 hours on it. The old engine was leaking oil and got the bilge pretty nasty. i cleaned some of it up but not anywhere close to all of it. If there is just a little bit of water in the bilge I dont see any oil in the water. But if the bilge gets a inch...
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    So do Cobra's have a trim limit or not?

    I could have swore I read on here a couple times that cobra's do not have trim limit and only a sender. Well today I decided to see what my trim sender looked like or if it was even still hooked up as my gauge is pegged up all the time. (it twitches when I use the trim). I took the trim...
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    Is an 88 Cobra drive a stringer or 800? Is it an electric shift? Lube?

    So what is it? From looking in the manual the model number is in there as an 88. But what dies that make it? Stringer, 400, 800? And which ones were electric shift? I read on the back of a gear lube bottle not to use it on electric shift OMC drives. Is quicksilver 90W good to use in this...
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    Damage from crap wrapped around prop?

    I was comin back in today after going out on the boat. On the way back in I was idling through the inlet to my dock and I felt a hesitation. It felt like if you were to drag bottom for just a split second. I was only about 1000 ft from my dock. When I got to the dock I shut the engine off...
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    Is the RPM gauge being off an engine thing or a wiring thing?

    I bought a brand new RPM gauge about a month and a half ago and when I have my digital timing light hooked up I can see that the gauge is way off. At idle the gauge shows 1K RPM but the tach gun (digital timing light) shows 650. And it just gets worse from there up. The gauge is brand new...
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    How tall are you guys biminis?

    I have a 25 ft Donzi. I bought a bimini from a marine store and on there size chart they ahvbe that all of theyre biminis are 48" tall. Well I didnt think anything of it but when I got it it is wayyyyyy too tall. I tried shortning it with the adjustments on it but its impossible, Im gonna...
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    What's the best stiff to use to fill fiberglass holes?

    I'm wondering what the best stuff would be to use to fill fiberglass holes like screw holes and maybe some bigger holes about the size of a quarter? Would resin and hardener be the best to use on the screw holes? Is there some kind of fiberglass filler that is strong that I could use? Kinda...
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