Is it "clutch dog clatter", "deaccleration knock" or someth

[wuzafed]

I have a 1995 90hp evinrude salt water series. When coming down off of 3,500 rmp +/-, I hear a clattering. Cannot really tell where it comes from but it was suggested it could be the clutch dog. The boat is in the shop now with a fuel problem and they are going to test drive it today before i pick it up tomarrow (Thur). I know they will want to fix the noise and if they say it is the clutch dog do I need to get fixed right away?<br /> I've got the shop manual on back order and should get it in a week or so. I'd like to use the boat for the next several weeks and repair the clutch dog this winter myself, if possible.<br /> Three quick questions:<br /> 1) Is repairing the clutch dog a real priority or can I get a couple more weeks out of the old one with causing any real damage? (The noise just started)<br /> 2) Using "regular shop tools" is it possible to replace the clutch dog (with the manual of course), or do you need something special, other then a new clutch dog and the appropriate seals?<br /> 3) While I'm in there what else should I check to see if it needs replaced? <br /> Thanks to everyone, your great!

 

[R.Johnson]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

To replace the clutch dog you will need a gear puller, or slide hammer to remove the prop shaft bearing head. You will then need a special snap-ring pliars to remove 2 beartrap snap rings. Don"t even think you can use screw drivers or pliars to remove these rings. You will need 250 + dollars in tools for this job. When apart, you will want to replace seals & o rings. You will also have to set the shift rod height wich takes a nother special tool. Tool's + manual=shop price-head ache

 

[P.V.]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

I would ask, if this really is "clutch dog chatter" it may not actually be a problem and may not be solved by replacing it........in fact, it IS noticable on many Mercs due to the design of the frd gear. Not common on OMC's....

 

[clanton]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

May not be gear chatter. Do you have the engine at a Johnson/Evinrude shop? Have them check for deaccelarate knock, when you pull the throttle back, crankcase has high vacumn and engine runs lean and knocks, try increaseing midrange jet.

 

[wuzafed]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Hi clanton, thanks<br /> She is at an evinrude dealer and I'll make sure I ask about the deaccleration knock. Thinking about the noise I heard, it sounded more like "knock" rather then a "clatter". The first time I heard it I thought someone had dumped a couple of marbles in the motor. It only does it when you pull back on the rmps. Thanks again

 

[clanton]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

 

[clanton]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Pull back on the throttle slowly, see if noisy stops. Drain gear oil look for metal in oil.

 

[WTDucks]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

I just went through a lengthy investigation of the clutch dog on my evinrude 25hp. Granted, its a different size engine and the year models are probably a good 15 or so years off but, if the basic design of the clutch dog has not changed, I do not see how the chattering your experiencing could be the clutch dog slipping. <br /><br />The Clutch dog slides back and forth on the splined portion of the shaft as you shift it in forward and reverse gears. It connects to the gears by locking into the center portion of the gears. The dog & gears have matching right angles where they connect to each other. These angles can become rounded (usually due to shifting in gear slow enough to hear a ticking noise) and cause the motor to jump out of gear completely or cause the motor to "bump" not clank. If your clutch dog was slipping you would notice a sudden loss of power along with the engine reving up dramaticly because the motor would have stopped turning the prop.<br /><br />Bet ya its something else making that noise.

 

[heyttown]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Just my .02$ worth, I had some rattling going on when I slowed down also, its was pretty loud. All it was, was the nut that attaches my hydrolic arm for my stearing came lose, at WOT there was enough torque on the motor to not rattle, but as I slowed down torque lessened and started the rattle. Im not saying this could be your problem, but any info cant hurt is the way I look at it.

 

[wuzafed]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Hi fellows,<br /> Goy my rig back Friday afternoon. They cleaned the carbs and replaced the roller sleve on the throttle. They drained 3/4 of the fuel from the tank (hope they tried to get from the bottem). They took her for test ride and the carbs loaded up again. They cleand them again, pumped fuel thru the lines till it ran clean from the tank to the carbs (They probably should have done this the first time they did the carbs). They put a tewpo in-line filter in, asked for check and gave her back to me. The tank is 1/4 full and I don't trust the fuel, or the tank (20 years old), for that matter. Purchased two 7.5 gal portable tanks and a switch valve that I plan to install today. If all goes well I'll get her out Sunday morning.<br /> I mentioned to the desk man about the deaccleration knock and he said he'd pass it along to the mechanic. The mechanic was gone when I picked up the rig.<br /><br /> Could carbs full of "crud" plug the midrange jet to cause the deaccleration knock? As I recall the knock started just prior to the fuel issue "shutting me down". Maybe the carbs being rebuilt and cleaned solved the knock. Hope to find out sunday, if I can get all my "honey do's" finished today...... Thanks again Ron

 

[wuzafed]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Finally got her out and was able to run at speed (for a change, with the fuel problems I was having). Anyway, if I came off "speed" quickly it would clatter more then if I would ease her down more slowly. Dosen't seem to be as loud as it was, but that could just be me. It really sounds like it is in the motor, rather then the foot, but I know that is just what it "sounds like".<br /> Once I get the shop manual I'll check the midrange jet. Any other suggestions? Thanks

 

[clanton]

Re: Is it "clutch dog clatter", "deaccleration knock" or so

Re: Is it "clutch dog clatter", "deaccleration knock" or so

The V8 had a vacumn switch connected to fuel valve to feed more fuel to engine at high vacumn, some of the Mercs had same setup. If your dealer will pick up the phone and call tech services, they probley could tell him the jet sizes or other changes needed to correct this. The last one of these I was involved with, an OMC rep came and work on the engine and changed the midrange jets, I missed the sizes because I was working on something else, shop chief took care of it, 2000 model engine.