1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

[B.autry4711A]

Hello,<br /><br />I have a question. When I run my boat motor on the trailer with the water muffs on the motor and full water pressure from the faucet, The heads are hot and I can hold my fingers on the heads for about 3 to 4 seconds however if I raise the RPM's somewhat the heads get cooler and I can hold my fingers on the heads for a while it seems they are actually alot cooler. Is this normal?

 

[Dhadley]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

Could be. But it could indicate that the deflectors are starting to swell. If the service history is unknown or you know they havent been repalced in the last year, then its a good time to do it now. Same with the water pump.

 

[B.autry4711A]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

Dhadley,<br /><br /> I have changed out the water pump and impellar last year. The motor seems to run good though so maybe I am being paranoid. Thanks for your reply.

 

[DHPMARINE]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

Temps and Rpms are hard to gauge.You may only be able to do 3 or 4 seconds on the head,my calloused finger tips may do more.<br /><br />But when you raise the Rpms,the thermostat relief valves may be comming off their seats,flowing more water,and cooling the engine down.Or the pump is pushing more water.<br /><br />You need a more acurate way to measure the temp. You can purchase wax temp sticks to apply to the heads.If 163* melts,TOO hot.<br /><br />DHP

 

[B.autry4711A]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

DHPMarine,<br /><br />You are saying this is normal basically?<br />Thanks, You guys are very helpful.

 

[B.autry4711A]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

Also there is no discoloration of the heads or block. These heads and blocks are the same black in color and there is no blistering of the paint.

 

[Dhadley]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

They're supposed to run warmer at idle but without knowning exactly how warm it is, I'd suggest looking at the deflectors. Especially if they havent been done in a while. <br /><br />Were they changed when you changed the pump?

 

[DHPMARINE]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

What I'm trying to say is you need an accurate way to measure the temp.<br />When that black painted block or cylinder head 'blister' you are WAY beyond normal temps,way beyond overheat.Probably internal damage.<br /><br />DHP

 

[B.autry4711A]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

DPMARINE/DHADLEY,<br /><br /> I have another question. Is there a guage/tool that can tell you how fast or hany many RPM's you are turning in the driveway? How many RPM's in nuetral are you suppose to turn and on the water? That could be one reason it gets hot at idle might not be turning fast enough. To me it seems everytime I run it it idles slow to me.

 

[B.autry4711A]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

DPMARINE/DHADLEY,<br /><br /> I have another question. Is there a guage/tool that can tell you how fast or hany many RPM's you are turning in the driveway? How many RPM's in nuetral are you suppose to turn and on the water? That could be one reason it gets hot at idle might not be turning fast enough. To me it seems everytime I run it it idles slow to me.

 

[Dhadley]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

A slow idle is good. It makes shifting easier on you and a lot of parts. From the control box to the gears.<br /><br />Yes, a tachometer will tell you the rpm's. I highly recommend one from BRP (they bought OMC) from any Johnson / Evinrude dealer. The idle rpm's in the driveway will be slightly higher because there is no back pressure on the exhaust. In the water you want it to idle at 650-750 in gear. <br /><br />As for revving it up in the driveway, I'd not recommend going over 2000 at the most. I usually just let mine idle. If you rev it too high without a load on the prop or no back pressure it may run away. At that point you'll have to flood it to shut it down. The key switch will have no effect. <br /><br />In the water and with a normal load you'll want to target 5800 rpm as your top rpm. That way no matter what rpm you cruise at, the motor wont be lugging.

 

[Joe Reeves]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

Bubba.... All of the above advice sounds on target to me. I could only add a few odds & ends.<br /><br />The 1989 88hp Evinrude/Johnson outboard..... On a flushette, the idle should be if a 20" shaft model 1000 rpm, a 25" shaft model 1200 rpm. The idle would drop to normal when in the water due to exhaust back pressure.<br /><br />A tachometer is a must, not only to set the idle rpm, but also to match a perfectly running engine to its propeller to obtain the proper rpms at the full throttle setting while underway. Also, a tachometer will pick up a engine problem that the untrained ear might not such as..... the normal full throttle rpm might be, as Dhadley states, 5800 rpm, then one day you notice that that throttle setting only results in a rpm reading of 5650 rpm, indicating a problem that one should not ignore.<br /><br />The thermostats normally open (if memory serves me correctly) at about 143° or 148° which will make the cylinder heads quite warm, and as DHP states, those water bypass valves will be forced open as the rpms are increased which adds a great amount to the cooling system qualities.<br /><br />Bottom line.... all may be well, however test the heat warning system. The warning horn should sound momentarily when you turn the key to the ON position. Then, find the TAN wire(s) protruding from the cylinder head(s). With the key in the ON position, ground that TAN wire. Grounding that TAN wire should make the horn sound steady and constant. If the horn does not sound, find out why as that's the only warning you'll receive if the engine overheats.<br /><br />With the heat warning horn system in proper operation, water test the rig for a final overheat problem.<br /><br />A temperture gauge and sender is available for that engine if that's your preference. If you install one, I suggest that you set the sender tip .010 away from the cylinder head surface. I've found that actually having the sender tip dead against the cylinder head will (at times) result in a false reading.

 

[B.autry4711A]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

I baby my motor. I treat it as I treat my kids. I don't want anything to happen to the engine as I always take my kids and wife with me and don't want engine to brake down on me. So far the engine has not let me down. It is pretty reliable.

 

[B.autry4711A]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

I do have one more question. I see there is one each light tan wire comming of each head. Where do I ground it out at at the engine or the control box up front?

 

[Cricket Too]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

You can just ground the wire to anywhere on the engine, the head is probably easiest, on a bolt head or something, you just have to complete the circuit.

 

[Joe Reeves]

Re: 1989 V-4 Evinrude 88 horsepower SPL E88MSLCER

Yep, what Cricket said.