Rebuilt Merc V-150

[Outrage 19]

I finished rebuilding a 1987 Merc V-150 SN: 0B156087 and got it in the water this past weekend. Now I need to go through break in but my tach does not work. Can I use an old style automotive tachometer the type that hooks up to the coil on a car, If so do I hook it up to the #1 coil or somewhere else?

 

[mellowyellow]

Re: Rebuilt Merc V-150

pretty sure the auto versions won't work.<br />I reccomend a "tinytach" for about $35.00<br />connects to 1 plug wire and ground and even<br />keeps engine hours.<br />good luck,<br />M.Y.

 

[Outrage 19]

Re: Rebuilt Merc V-150

Thanks mellowyellow, I will be fixing the OEM tach eventually but for the time being I’ll pick up an inductive tach that I can use on the car later.

 

[Outrage 19]

Re: Rebuilt Merc V-150

Next question, to get the power head off I had to heat, beat, pry, wedge, heat some more beat some more, wedge some more, pry some more, and cuss allot. The marks left from this process aren’t sealing with just the gasket and so I have water coming out from between the power head and exhaust housing. I figure this is supply water from the water pump since no matter what the temp of the water at the pee hole is this water stays cool. Will a good thick bead of Permatex seal these leaks and if so type 1 or 2, or should I use JB weld or some thing like that and try to file the surface smooth?

 

[Trent]

Re: Rebuilt Merc V-150

Use Loctite 518 or 515. This stuff is being used more and more instead of gaskets or with them also.<br /><br />

You can get it at your local autoparts store.<br /><br /> web page

 

[AndyL]

Re: Rebuilt Merc V-150

I just want to congratulate you on your perseverence on the rebuild. Thats all.Well done.<br />Andy

 

[Outrage 19]

Re: Rebuilt Merc V-150

Thanks Trent the more I read this board the more I learn.<br /><br />AndyL I appreciate the congrats we’re 4 ½ hours into break in and so far no strange noises, it starts easy and runs cool using the hand on head test. I have a couple of electrical problems to work out (Tachometer, Trim Indicator, and Warning Buzzer) but all seems good. I’m afraid to take the RPMs up any more until I get this water problem fixed. I should be ready for fall Rockfish season by the end on September.<br /><br />Thanks to everyone who gave your advice and opinions, it was all appreciated.<br /><br />Nick

 

[jim dozier]

Re: Rebuilt Merc V-150

Is that something that could have been machined flat by the machinist that bored your cylinders while you had the power head off? Sounds like you have got the power head back on so it may be too late for that. You may be able to fill in gouges with JB Weld epoxy and sand it flat. Then whatever gasket and sealant you use will have a flat hard surface to bond to. Good luck, I know you've come a long way with the powerhead.

 

[KCLOST]

Re: Rebuilt Merc V-150

Outrage,<br /><br />Keep us posted on the break-in... Let us know what kind of Temps you end up having at full throttle...

 

[Outrage 19]

Re: Rebuilt Merc V-150

Ha jimd good to here from ya. I would think that milling the exhaust housing would make it too shout for the drive shaft. I took a good look at the area where the leaks are last night. The biggest feeler gage I can fit in there is .008. I believe Permatex should seal but don’t know which one to use, blue goo or brown goo. If I need to do more than that I figure the best thing to do is pick up a used exhaust housing this winter from ebay. I also need to pick up a steering swivel pin since the bottom spines on mine are about half rusted away. Thanks for the suggestion thou.<br /><br />KCLOST I’ll see what the price of one of those laser temp gages is and if it’s not to expensive I’ll get one and keep you posted.

 

[Outrage 19]

Re: Rebuilt Merc V-150

<<<>>>

 

[KCLOST]

Re: Rebuilt Merc V-150

Outrage,<br /><br />Forget about the lazer temp gauge... You will never be able to get a reading on the head. (not at full throttle, you might kill yourself trying).. I have access to one and I didn't even attemp it... I thought you might have had a temp. gauge... The temperature at full throttle on our engines has been a hot topic lately, pardon the pun....

 

[Outrage 19]

Re: Rebuilt Merc V-150

Being a Boston Whaler my transom well is very open On a calm day I don’t think it would be a problem, but the cost of the laser temp gun is. I’m still going to use the hand on head method. If you can hold your hand on the head for 5 sec with out getting burnt your ok.

 

[Outrage 19]

Re: Rebuilt Merc V-150

Thanks for the tip Trent. I couldn’t find Loctite 515 or 518 but Permatex’s The Right Stuff says it does the same thing, and it does. It was a little pricey but it sealed up the water leaks and I now have a good stream of water coming out of the tell tale. Now I can finish braking her in and start fishing.

 

[JerseyJim]

Re: Rebuilt Merc V-150

outrage - dont buy the temp guage from NAPA (i got screwed too - $90) .... Buy it from radio shack!! It's 29 bucks.<br /><br />I keep mine in the boat at all times, and check the motor temp about every other trip.

 

[Outrage 19]

Re: Rebuilt Merc V-150

Finished the brake in this past weekend and got to see some of Isabel’s damage from the water. Man some people have a real mess to clean up and others had a lot of real estate wash away. The worst part to me was my favorite bar was gutted.<br /><br />Anyway here’s my question. How can I be sure that the oil injection system is working? The tank in the boat is filling the tank on the motor, but how can I tell if the pump is pumping it to the check valve and mixing it with the gas? How much oil should this engine use in say a 5 hour run at 3500 to 4500 RPM? I don’t what to stop double mixing until I’m sure the oil injection is working. Thanks in advance.

 

[jim dozier]

Re: Rebuilt Merc V-150

I don't know about the Merc setup but my manual for my Suzuki listed a pumping rate in milliliters over a specified time period. I hooked up a large syringe to the oil pickup tube and measured it. It was right on spec.

 

[Outrage 19]

Re: Rebuilt Merc V-150

Thanks jimd. What did they say the flow rate should be?

 

[jim dozier]

Re: Rebuilt Merc V-150

I'm at work so I don't have the numbers, they wouldn't match your engine anyway, mine is an 85hp 3 cylinder. It was something like 8-9 ml over 3-4 minutes at max rate and a lot less at min rate. My point is that each engine (I would think) has a specified rate and a good book ought to tell you how to measure it. Mine was relatively easy to measure and check.

 

[jim dozier]

Re: Rebuilt Merc V-150

Here, I found my numbers for a 1987 Suzuki DT85 in an old post. At 1500 rpm with the oil pump set at minimum rate, it should pump 2.2-3.7 ml at 5 minutes. At 1500 rpm with the oil pump set at max (there are three marks on the oil pump, this is where a manual is handy) it should pump 5.9 to 8.9 ml at 2 minutes. Again, these numbers are engine specific.