60 degree looper150 HP rebuild thread

[metriccrescentwrench]

Re: 60 degree looper150 HP rebuild thread

It sounds like you've talked yourself out of a complete rebuild. At least at this point you know what you've got, and that it'll be put together properly with all good seals etc.

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

Yes..my wallet has pretty much talked me out of it for now. The main thing is now I will know that the rod bolts will be properly torqued. So I should be good. there is the chance that they were good to begin with, but I think it will give me some peace of mind. I am considering investing in a good hone, i have a cheapo one, but I will see. I am going to check cylinders for out of round first.

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

Ok..I checked everything out I knew how to check, and it was all with in tolerance. hone job was not that great but I let it slide. I put the crankshaft and pistons back in, put the heads back on and the starter/flywheel. I now have
1 = 102
3= 105
5 = 110
2 = 98
4 = 102
6 = 105

I figure that the heads may have been the cause of the low compression earlier, new seals seems to have helped. I replaced upper and lower crank seals also. I hope it cranks up good..update soon

 

[j_k_bisson]

Re: 60 degree looper150 HP rebuild thread

The low one is the overbore? Is it a new set of rings on that one? If so then those numbers will come up.....

Did you check the head for flatness? I think the spec is 0.005" max in any direction.....

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

the #5 is the over bore. all the rings are new. I did not check the heads for flatness. I need a good piece of square stock. I am going to run it some and then recheck compression. from what I understand 95-100 PSI is good on these motors. the overbore cylinder is the high one.

 

[j_k_bisson]

Re: 60 degree looper150 HP rebuild thread

So did you get it running? How is it?

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

yes it is running, it was a little tight, I could not spin it over by hand turning the timing wheel, but it did turn over fine with the starter and cranked up and ran nicely. water leaking at the power head base. I used a new gasket, guess I will have to take it apart and use some gasket sealer on both sides of the gasket.

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

Ok I finally got time for a test run...the compression seems all good, Motor starts and idles perfectly. I ran it today, hit 5100 RPMs at about 34 MPH with a 15 pitch prop. before I took it apart I hit 4900 RPMs with a 19 pitch prop at 39 MPH. the motor is still very tight and I cannot spin it by hand, by turning the timing wheel. before I took it apart you could easily spin it by hand. The motor sounded good, no knocking or anything, also ran very smooth, although it did jump a couple of times like it was getting ready to kick in some more Horses, but just smoothed right back out. spark and timing both seem good. new plugs. carbs are all clean and seem to be flowing fuel like they should.

any ideas on why it is so tight?? or what would you check/recheck???

just for reference I had a 1999 115 60 degree on it, and it ran 40 MPH at around 6K RPMs with a 17 pitch prop...

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

I am thinking about removing the crank cover and re-torquing the rod bolts, I am not sure why the engine is soo tight.

 

[j_k_bisson]

Re: 60 degree looper150 HP rebuild thread

Any of your seal ring on the crank bent? Or did you get any sealant neer those passages? That would give in to a binding condition. But after running it it should have cleared up.

You check you end play on the crank? UpDown movement? Is it in spec? That should tell you right there is there is something wrong.....

I'd guess the ring like I said. Either bent or too thick or out of alignment when you assembled and toqued the crank. Did you give the crank a love tap in both directions to center those rings before torquing the main bolts? Probably this issue.....

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

I found out my problem, the upper main bearing sleeve did not line up with the pin, it cracked the sleeve, but the bearing looks ok, I will get it fixed this week. hopefully it did no other damage. Faz helped me to find this problem, he has been a great help and I greatly appreciate it. and thanks to all who have been so helpful.

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

Ok I got it all back together, I can now turn the crank easily by hand...no damage seems to have been done. good spark on all cylinders, timing is set perfect, linkage is synced, compression is good. I got 37.5 MPH at 5250 RPM with an aluminum 15 pitch prop running down river, I got 39.5 MPH at 4600 RPM with a 19 pitch SS prop. this is the second mid 90s 60 degree 150 HP motor that I have owned, both motors were missing about 30-40 HP. this motor is currently preforming just slightly under the 1999 60 degree 115 HP motor that I had on it, which ran out like a champ. I also had a 2003 Yammy F115, which ran out about the same as the 60 degree 115. Both ran out at about 40 MPH and hit around 6k RPMs. I think this must be more than a coincidence. for some reason these mid 90s 60 degree 150s seem to be lacking HP. the motor cranks perfectly, idles great, runs out through all RPM ranges with perfect smoothness, no skipping or surging...On the last motor I had I replaced all of the electronic components with new CDI brand, I gained 300 RPMs and a few HP, but it still did not out preform a good running 115.

Any ideas would be welcome.

thanks Sparkie

 

[BigBassin78]

Re: 60 degree looper150 HP rebuild thread

My 95 150 fast strike is pushing me 58 @5100rpm 24p raker in my 18' javelin 1750lbs loaded. I'm fixing to put a 22p on it and see what happens. You're missing power somewhere, though I couldn't tell ya... Good luck man!

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

yea I know, I am missing about 35 HP..not sure where it is hiding, I have checked every conceivable place...your motor should like that 22 pitch prop better, I know these motors are supposed to like 5500-5800 RPM range. the 115 60 degree I had loved it around 5800 RPMs.

 

[Faztbullet]

Re: 60 degree looper150 HP rebuild thread

How did you set the WOT timing???

 

[BigBassin78]

Re: 60 degree looper150 HP rebuild thread

How did you set the WOT timing???

I have not messed with the timing since I have owned the boat, since it runs pretty well I don't want to screw anything up,ya know. All i know is that the timing advance works as it should.

 

[SparkieBoat]

Re: 60 degree looper150 HP rebuild thread

I followed the instructions per CDI, ground the brown wire going from temp sensor to power pack than move throttle to wide open and set timing to 20 BTDC. I also double checked it while running WOT down the river to make sure.