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#11
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Joker, I agree w/Ferm about raising two notches...I wouldn't worry about the gap you'll create by raising it...
Although I have advocated using large diameter props for these boats, I also know that while it worked on mine, it may not be best for all...first, raise the motor and see what difference(s) that alone makes...if yer still hearing the rattle and sure the noise comes from the lower, you might try a smaller dia prop...try to make only ONE change at a time...that way yer not scratchin' yer head over WHICH change made the difference... Hope yer not losing any lower unit oil...have you pressure tested it?... Rattling on those motors (I had one) is often due to the magnets under the flywheel coming loose...knowing sometimes it's hard to isolate noise, could it be coming from up top?...just thinkin' out loud...
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#12
11-09-2011, 10:43 PM
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Thanks, I will try these changes, I'll check my lower unit oil, but I never had a problem with leaking, the reason I am wondering about the lower unit is that when I got this motor the mechanic told me it was a year newer than the rest of the motor. So I am wondering if something is loose or something, maybe in the spring when I have my water pump done I will ask my new mechanic to take a look.
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#13
11-10-2011, 08:21 AM
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I also agree with the experts, raise the motor.
Along the "dinged prop" lines. This past summer I hit a tree or log or something wooden over at Jordan Lake (I was in the marked channel but water was so low I hit something). Right away, my cruising speed dropped by about 7-8 mph with what looked like a simple "dinged prop". It also started making noise because the prop was out of balance. Put on my spare prop, instantly back to normal. Just something to think about.
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*************************************** Stay Safe!  Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke. 1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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#14
11-10-2011, 08:48 AM
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x3 on raising the motor. Fix the prop, service the lower, and check the latches on the outboard cowl. My Johnny started to rattle and it turned out to be the latches. Glued in a thin piece of rubber to keep the latch quiet. Lost the rubber and discovered that the silicone caulk served the same purpose. Found it while poking and prodding around back there while on plane, actually put my hand on it to keep my balance to lean over the back and the noise went away. Second best guess would be the exhaust can rattling around if the mechanic didn't put it all together correctly, maybe he forgot the rubber at the bottom of the exhaust where it goes into the lower.
I do not believe you will see many more RPM from motor height adjustment. Something else, maybe the prop, your rpm is off by over 1000.
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 1996 -19' NV Flats 115 Mercury 4-stroke 1983 -20' Wellcraft Center Console 250 XS Last edited by RidgeRunner; 11-10-2011 at 08:54 AM.
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#15
11-12-2011, 04:38 PM
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Well pulled the boat for the season today, upon inspection I found the cause of the rattle. A while ago I had a rattle and found out it was my trim rod rattling when I went over 2000 RPM's because the water was pushing up against it. I used 5200 all around where the trim rod goes through the bracket, rattle was gone, used it all summer, no rattle. Well the 5200 let go and the rod is loose again. I think when I raise the engine I won't have the water forcing up against the rod and therefore no rattle. By the way do I need that trim rod? it doesn't seem to do anything, even when I lower the engine all the way down it doesn't touch. Thanks
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#16
11-13-2011, 07:41 AM
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Quote:
I'm trying to picture a "trim rod"... 
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha
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#17
11-13-2011, 08:16 AM
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At the botom of the engine bracket there are 6 holes ( two rows of three ) on approx. a 45 degree angle, there is a stainless rod ( about 5/8" Diameter ) going through one of the holes to the other side of bracket with snap rings on each end to hold it in.
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#18
11-13-2011, 08:32 AM
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#19
11-13-2011, 02:04 PM
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I am no expert for sure, but I would think that piece would only be needed on a motor with no power tilt/trim. Unless on your particular boat it is possible to tilt the motor down so far it would hit the boat.
That being said, on my 1972 25hp Evinrude, there is a spring on the one end that keeps that bar nice and snug in its place. Maybe you could find a spring that would work for yours if you need it.
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*************************************** Stay Safe! Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke. 1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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#20
06-04-2012, 09:45 AM
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I raised the engine 2 holes, took it out and it seems smoother and the wake is now clean and no spray, I heard a little loss of bite around a hard turn in the chop, but I was running it pretty hard, I think it should be fine for normal use, no issues with the temp. Now I will mess with a new prop. I maxed out @ 4500 RPM's with last years plugs and gas ( 1st trip of year ) 5 people 2 adults 3 kids and 40 gallons of gas. No GPS on boat so, no speed yet. The prop is all dinge up I filed it smooth but it's a mess 15 1/2 X 15
was reconditioned for more RPM last year. I have to start fresh. Any recomendations on prop size if I want to go to SS or stay with Alum ?
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