V4 CROSSFLOW HELP,REBUILD.

robtado

Cadet
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Sep 14, 2021
Messages
7
Hello yall,
i was wondering if anyone who has some experience with these engine could give a liitle input on my situation. i have a VE100SLESB 100 hp evinrude outboard. it is a flatback v4 crossflow engine. my problems started when i bought the engine and it had off compression.the 2 cylinders on the right(2,4) had 90psi and the 2 left cylinders(1,3) had 80 and 70psi.
the egine would not go over 3000 rpm and i could not go over 10 mph on the water. i have a 18' wellcraft 190ccf boat. boat came with engine from the factory. i originally thought there was an electrical problem and after replacing the power pack ,spark plugs and wires,,testing coils at load,new rectifier regulator and checking timing i was stumped. i decided to re-ring the 2 cylinder that had low compression.
when i tore the engine apart and was checking the cylinder bore ID, i noticed that the #1 cylinder had a pit/hole in the bottom of the cylinder almost at the very bottom.it is almost a perfect circle and didnt know what to make of it.

the question i have is .does this cylinder have a hole in it from factory or has something cause this. second question is since the hole is all the way at the bottom way past the rings,will this affect compression or the way the engine runs. and third could i get this hole welded shut and just have the cylinder re-bored to fix the problmem or should i jst leave it alone.

thankyou again for any help or input.
 

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racerone

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Dec 28, 2013
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???----Leave that hole alone !!----It was put there by the factory.------Look the block over carefully to see what the purpose is for this hole.----Work carefully on your rebuilding.-----Assumptions / mistakes can be costly.-----And I do not like that black sealer used on the crankcase half joint.-----Use factory gel seal.
 

Faztbullet

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Mar 2, 2008
Messages
15,931
Spray some carb clean is so called hole and watch where it comes out...then you will see purpose of hole. Someone has been dinking with motor before you so check pistons to see if installed correctly and if bored oversize. Do not try to re-ring motor is worn past its limits (.003) Boat is also on the under powered side
 

robtado

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Sep 14, 2021
Messages
7
Thank you for your reply. The reason I asked if anyone knew it was factory ,was because there is a small brass plug that almost looks threaded from inside the cylinder almost directly inline with that hole on the crankshaft side of the block right next to the crankshaft journal.

Great idea with spraying carb cleaner to find where the hole goes. I'm ultimately going to take it to a shop to make sure the cylinders are not out of round and in spec to re-ring and if they are out of spec I will probably bore the affected cylinders to oversize with correct piston.
When I get this bad boy put back together is there and quick mods that would let me pull more power out of this engine....carbs,etc?

Thanks again for your replys
 

racerone

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Dec 28, 2013
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The ----" brass plug " ----Is an expensive check valve.----It is press fit in place.-----Depending on how many hours on the pistons it is not a good idea to put new rings on older factory pistons.---Simple as that !
 

Faztbullet

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Mar 2, 2008
Messages
15,931
When I get this bad boy put back together is there and quick mods that would let me pull more power out of this engine....carbs,etc?
Yes but it would be cheaper to sell it and by bigger motor. You have the old style 115 de-rated to 100 hp at prop. Max you can get is about 10-15 hp extra with a lot of work and $$$/ Cheaper to by a140hp looper..
 

robtado

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Sep 14, 2021
Messages
7
Thankyou again formally the help. For an update I have completely rebuilt the engine .I had one of the cylinders bored .030 over and installed new piston and re ringed all the other pistons. Compression is back up to 100+ on all cylinders. I installed all new spark coils and installed a spare 6 gallon tank to bypass old fuel system.

The engine runs great with no sputtering,starts right up on first turn of the key and idles great. BUTT ! I still have the same problem of the engine not going over 2500-3000 rpm at full throttle under load.

I found a lead to what might be my problem,when I was running off the spare tank and started to run out of fuel the engine picked up and went to 4500 rpm. I tested this again by running off my inboard gas tank and pinched the fuel line and to my suprise the boat was running at about 4700 rpm as long as I hit thatbseeet spot while pinching the fuel line.

My question is,could I have an oversized fuel line. Or is there a restricting orifice that I am missing. Or do the floats control the fuel mixture in some way.. I know the jets are what meters the fuel and I inspected them and they are all 60c which is in spec for this engine.. I'm running out of ideas.

If anyone has any idea where to go from here I would love to hear it, thankyou.
 

racerone

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Dec 28, 2013
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What fuel pump is on this motor ?-----New rings in worn out pistons / grooves is a mistake.
 

robtado

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Sep 14, 2021
Messages
7
I have also read on some forums that the tilt/trim sensor on some outboard might affect the engine being in a slowmode... would this model be affected by something like that because the trim sensor on this boat has been cut off.
 

racerone

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I don't think a trim sensor has anything to do with the ignition system.----And I do not believe that a 1990 V-4 crossflow has the S.L.O.W. system either.
 

racerone

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Dec 28, 2013
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38,845
Start motor and run at idle.----Pull plug leads off one at a time and see what happens.------Sounds like engine is flooding or running on 3 of 4 cylinders.-----In what position is the red lever on the electric primer valve.
 

robtado

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Sep 14, 2021
Messages
7
I will have to test the spark on the plug wires when I get it back together , I took the carbs off to check float level... but last week when i used a spark gap tester everything seemed to be ok.. the red flag on the primer pump is inline with the pump
 

robtado

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Sep 14, 2021
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7
Sorry about that . The red flag on the primer valve is inline with the valve. It's running hotdogs ways. :)
 
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