35 hp evinrude pumps good except when planing?

[a1bigmike]

Re: 35 hp evinrude pumps good except when planing?

Pulled boat out of water will repost pics of the setup this week.. Going to pull bottom end off and inspect water pipes and gaskets.. thnx to all who have helped..

 

[a1bigmike]

Re: 35 hp evinrude pumps good except when planing?

Took the foot back off of and inspected all the pipes and gaskets and pump everything checked out good (just like new). Metal water pipe fits snug into grommet on bottom of engine housing. Decided to pull the cylinder head cover off and check the thermostat. I found that someone had removed the thermostat completely. Not sure if this could cause the water flow while planing issue But I have heard that not having it in can cause the motor to overheat due to water flow to fast to absorb heat from head and also that lack of restriction keeps the water from filling the cooling passages fully to the top of motor. So I ordered my new thermostat and gaskets. Hope to have back in water this weekend to retest.. thanks for all input.. will re-post updates.

 

[chuckp]

Re: 35 hp evinrude pumps good except when planing?

Hello a1bigmike,

Did the new thermostat help with the water flow while planing or with the water output steaming?

Chuck

 

[a1bigmike]

Re: 35 hp evinrude pumps good except when planing?

Srry on delay of repost. Due to work and free time havent gotten back in water yet.. Plan to this week. Also got a set of dol-phins I am putting on to help with planing due to boat weight and size.. Will post as soon as its in.. Thnx

 

[a1bigmike]

Re: 35 hp evinrude pumps good except when planing?

WELL THIS HAS BEEN WAY LONGER THEN EXPECTED. GOOD NEWS THOUGH!! Turns out the idiot who helped me install my impeller while I was rebuilding the foot BECAUSE !! He supposedly knew what he was doing .. Installed the impellers different ears pointing in opposite directions.. Watched him doing and asked wtf? Told me they change directions when switching from forward to reverse.. WRONG!! NOW i KICK MYSELF BEING A MECHANIC!! Drive shaft spins clockwise. After talking to a customer who actually knew his stuff. I got it straightened out YAY!! All is good know! Thanks for patience to all!

 

[samo_ott]

Re: 35 hp evinrude pumps good except when planing?

Seems odd. They should just flip over as soon as the driveshaft turned.So you took it apart and they were still flipped the wrong way? Weird.

 

[nwcove]

Re: 35 hp evinrude pumps good except when planing?

WELL THIS HAS BEEN WAY LONGER THEN EXPECTED. GOOD NEWS THOUGH!! Turns out the idiot who helped me install my impeller while I was rebuilding the foot BECAUSE !! He supposedly knew what he was doing .. Installed the impellers different ears pointing in opposite directions.. Watched him doing and asked wtf? Told me they change directions when switching from forward to reverse.. WRONG!! NOW i KICK MYSELF BEING A MECHANIC!! Drive shaft spins clockwise. After talking to a customer who actually knew his stuff. I got it straightened out YAY!! All is good know! Thanks for patience to all![/QUOTE

were the vanes on the impeller all pointing the wrong direction....or did your helper point a couple right, and a few wrong??????......just curious.

 

[a1bigmike]

Re: 35 hp evinrude pumps good except when planing?

To answer: When watching him while he was helping assemble the impeller housing he just crammed them in some one way some the other.. I asked_ Shouldn't they all be facing the same direction? - And he answered what previously posted. Well after frustrating time frame of water flow issues a customer of mine at my auto repair shop spoke of past experience in outboards. So I asked him and explained my situation >> He said rather quickly! Sounds like you might have impellers installed wrong.. This will pump at low speed but when the rpm increase's the impellers that are contradicting the flow actually cause enough turbulence to cause a air pocket to brake the suction of water! The proper way to Install the impeller into housing is to put the drive shaft into the foot with impeller on the key way above the bottom mounting plate. Slide the housing down over the impeller while rotating the drive shaft counterclockwise allowing the impeller ears to work there way into the housing! (Put the lube on the impeller And housing rim) It slides right in and verify proper direction. Bolt down reinstall foot and BOO-YA! Good luck to all.. AND AVOID KNOW-IT-ALL'S!

 

[nwcove]

Re: 35 hp evinrude pumps good except when planing?

lol.....sounds like your helper had good intentions! ......some vanes clockwise for forward pumping, some counter clockwise for reverse! ( i think some old steam engines actually reversed crank direction for fwd and rev......maybe your (ex) helper has one of those old locomotives!)

 

[F_R]

Re: 35 hp evinrude pumps good except when planing?

I really am glad you got it fixed and working. Honest. But I gotta say that of course you should install the vanes pointing the right way. However, I also gotta say that if you install them backwards, they will flip over as soon as you start it. Speaking of a NEW impeller here. I also gotta say that when the motor stops and bounces backwards off the last compression stroke, it may cause one or more vanes to flip over backwards, and they too will correct themselves when you restart it.

So, by taking it apart and doing the job over, you corrected whatever was wrong without realizing it. I have no idea what that something was. But it is fixed, so mission accomplished.

Before I end this post, let me say that I am talking about the motor in question. SOME motors with short stiff vanes may not correct themselves. But a 1978 35hp isn't one of them.

 

[a1bigmike]

Re: 35 hp evinrude pumps good except when planing?

Thnx for the best wishes first off. Nwcove- I do believe his intentions overseen his knowledge and he was to Cocky to admit! Overconfident and afraid to admit lack of knowledge.. If you don't know something don't act like you do ! In anything it is not good.!! I am the first to admit If i don't know or am not sure.. And he is definitely a locomotive! Without the steam.. lol Thnx for response.
F_R- When I rebuilt the bottom end the pump kit had been revised to a plastic housing with a metal insert.. The impeller is a much tighter fit in the new housing and the ears are a lot stiffer and shorter. Not sure if you are familiar with this revision but When the impeller is on the drive shaft the ears are very tough to get into housing. When I disassembled the unit only after 10 hours of use. Not sure which way the impellers were but two of them had nicks from rotating the wrong direction I assume.. Other three were new as new!

 

[F_R]

Re: 35 hp evinrude pumps good except when planing?

Oh well, I and everybody else assumed you still had the old pump style in there. Note that I did mention short stiff vanes.

 

[a1bigmike]

Re: 35 hp evinrude pumps good except when planing?

Oh well, I and everybody else assumed you still had the old pump style in there. Note that I did mention short stiff vanes.

Yes you did.. The old housing was so pitted this was the new revision..I appreciate your input anyhow! Thnx again!