Evinrude 150 HP Cross-Scavenged?

[paul1201dog]

I have a 1984 or 1985 Evinrude 150 hp Anniversary edition V6. I am looking to buy a new fuel pump (VRO) for it. I think I still have the original pump on the motor due to the fact there is No electrical connection for a "NO OIL" warning. I have installed a new oil tank that does have a low oil warning. I have read about some of these motors (or all) being a cross-flow or cross-scavenged design. Is there a way I can tell? Just trying to educate myself on this motor.

 

[Joe Reeves]

Re: Evinrude 150 HP Cross-Scavenged?

There are "Crossflow" engines and there are "Loop Charged" engines. Your engine is a "Crossflow" engine.

Did you just purchase that engine? If so, ask the previous owner if he did away with the VRO and was premixing his fuel/oil. If he was, then he was using the VRO simply as a fuel pump. If he was, the oil side of the VRO pump should have been plugged.

If you're determined to rig the engine to be using the VRO setup, you'll need a new type VRO pump that has the latest warning circuit setup.

However, before you do anything, be sure to take a compression test, a spark test, and check the lower unit for water. Compression should be approx 100+ and even on all cylinders. Spark, with the s/plugs removed, should jump a 7/16" gap with a strong blue lightning like flame... a real SNAP! The lower unit lube should not be milky but rather something like 90 weight oil.

Let us know what you find.

 

[paul1201dog]

Re: Evinrude 150 HP Cross-Scavenged?

Thanks for the response Joe.
I purchased the boat about three years ago on a whim, it is a 1986 Mach 1, looked good but when I got it home I realized the transom had been getting wet and was rotted and the fiberglass was cracked. I repaired it and had the fiberglass repaired and now I think I have a good transom for a few years.
I was laid up for about a year with shoulder surgery and last year finally got the motor back on and in the water! I had some trouble getting it running, took it to a mechanic and replaced all the electronics except for the coils, rebuilt the carbs and thru a set of plugs in it. The mechanic is an Evinrude guy seemed very knowledgeable, said the motor checked out good also changed the oil in the lower unit.
I had the motor on on a steel table in the parking lot of the shop I work at. Here in the southwest we get monsoons with quit a bit of lighting and wonder if there was a lighting strike close by that messed up the electronics?
I've had a few outings, a few just running around the lake and then pullings my kids (read adults) in a tube, having fun. This year I am getting the boat ready and noticed that as I was priming it there was fuel leakage from between the pump seams. I have always been concerned about the pump so I was also mixing oil into the gas (double oiling). The VRO was working good I think as the oil in the oil tank was being used. I did not want to spend the extra money on the pump but now it seems I have to.
I was reading about the crossflow motor and thought the VRO hooked up differently, a fitting between two crank fitting but the pump I have now only has one line into the crankcase to run the pump. As I understand it the cross-flow is just a cylinder design to exchange the fuel mixture.
So I have the new VRO part number, need to get a new harness because my old pump did not have a "No Oil" warning on it.
The two issues I have been experiencing is the motor not wanting to idle and then running WOT it would cut out on me, it did not die but dropped back to an idle, I had to pull the throttle back to neutral and then to forward and she ran again. Maybe fuel pump issues?
Hope I did not ramble to bad just wanted to give a little history

 

[Joe Reeves]

Re: Evinrude 150 HP Cross-Scavenged?

A bad idle could be due to many things.... slightly restricted idle jets, linkages between the carburetors causing the butterflies NOT to be opening and closing at the same time, a compression or spark problem, worn spark plugs, etc. If a jet restriction, with face plate removed, and the engine idling as best it can, stick two fingers into the carburetor throats... when the engine smooths out somewhat, you've found an offending carburetor.

Dying out at full throttle.... Does the fuel primer bulb go flat? That would indicate a fuel restriction at the tank.... Does pumping the fuel primer bulb cortrect that problem? That would indicate a fuel pump problem.