Reroute telltale to top??

Jamar

Petty Officer 3rd Class
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Sep 4, 2002
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88
Have read on here that this is better than the orginal location, I assume it just insures that water is making it all the way up and not just to the bottom. Have looked over engne and wonder where/how to do this. I have mid 80's 90 v4 Evinrude. Anybody wanna give me a free education.
 

Dhadley

Supreme Mariner
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Feb 4, 2001
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16,978
Re: Reroute telltale to top??

On those we just put a "T" in the top of the block on the starboard side and tap into the existing line. It allows any air trapped in the top of the block to escape. <br /><br />Good luck!
 

Jamar

Petty Officer 3rd Class
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Sep 4, 2002
Messages
88
Re: Reroute telltale to top??

Thanks Dhadley. Have read many of your posts to others and appreciate the time you spend on here giving us shadetree's good advice. Would you mind telling me specifically where to put this "t' in at? Is there a bolt or something i can remove that opens up to a water jacket?
 

Dhadley

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Re: Reroute telltale to top??

It's very simple. Get a fitting (number 337594 - local J/E dealer), drill and tap into the water jacket on the top of the block above number one cylinder (flat area). Drill into the BLOCK, not the cylinder HEAD. The water jacket (space)is about a 1/4" deep at the top. The block itself is an 1/8" or so. I go forward of the head gasket a 1/2" or so and center in the flat area. <br /><br />Use your existing hose on each side of the T and you're set.<br /><br />Good luck!
 

Jamar

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Re: Reroute telltale to top??

Thanks Dhadley, if you ever head up to North AL give me a shout. I owe you a beer or twelve.
 

P.V.

Chief Petty Officer
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Mar 14, 2002
Messages
452
Re: Reroute telltale to top??

I believe that people are refering to the 50,60, and 70 hp. OMC outboards, 49 and 56 ci. 3 cylinder motors. Not to V-4's. OMC has a bulletin about proper location and the specific models. Do not just do it on just any engine!!
 

Dhadley

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Re: Reroute telltale to top??

The same theory applies whether its a 2, 3, 4, 6 or 8 cylinder E/J outboard. We giving air a place to escape from that may be trapped at the top of the block. On V type engines this has saved the water cooled regulator / rectifier and reduces the carbon / coking build up on the starboard side. <br /><br />We have done this successfully since 1982.
 

P.V.

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Re: Reroute telltale to top??

Am not one to dis-agree, (OK, Maybe I am), OMC did provide a bulletin specificly to address that problem on the 3 cylinder motors. They have not directed dealers/customers to do so on other motors. They (OMC) did rework the exhust covers on later 2 cylinder motors and located the tell-tale higher onto the upper exhust cover, but not onto the block. Can you do it to a V-4 ?? Sure you can. Are the benifits the same?? I would ask why didn't OMC suggest the "field-fix" to those motors?? Not trying to step on any toes.. .
 

Dhadley

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Re: Reroute telltale to top??

I can tell you exactly what OMC engineering said about it - on the record and off the record. Better yet, look at where they went with the fitting as they moved to newer style motors.<br /><br />Even an OZ motor was top vented - on both sides!
 

P.V.

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Re: Reroute telltale to top??

OK, Either on the record or off, tell me. Exactly. Look, I understand the "benifits", I just want to know if you "came" up with this or if OMC engineers "enlightened" you and how come they didn't let the rest of the world in on it ???? I'm not trying to be an a#* about this, I trust your input. It's just that before I go drilling holes into my block, I would like to know that the "all knowing,presumably better inform'd-than-I engineers at OMC" say to do so. And if they say "Hey!!, It coudn't hurt!", well,I guess that's SOME input, anyway. I'll tell you a little story, Some years ago, I made the mistake of buying a remanufactured powerhead from a then, little known (well, not as well known as today) outboard company in Florida. I decided to inspect the thermostats prior to installing it on the customers engine. Thermostats were the eziest to look at without really disassembling 'hard' parts. Anyway, the springs are cut off about 3 wraps from stock and someone has filed a larger groove on the top of the theermostats. I called the "service guy" at this company and am informed that "in Florida", we always cut the springs to "reduce block pressure and allow for more water flow", now, how am I supposed to know if what they are doing is "acceptable" in ANY way at all ???? Sure, we often like motors to run cooler at WOT, but what does this do to low speed running, long term ??? Do I feel confident that they have done any real TESTING for my benifit??? Or do they "think" it will be better ??? When I ask'd OMC about this, they said, No, we don't know What they are doing!! And they did not recomend doing so !!<br />So, my question is this, if OMC engineering told someone, on or off the record, to drill a new tell-tale hole on a V-4 block OR V-6 block, that's the firsat time I've ever heard of THAT!!!!Why the secret??? We've had V-4's since, what?, 1958?? Does this apply?? Why, if OMC would put out a bulletin for the 70 hp motors would they NOT put out one for the V-4's??? If it's that benificial, then EVERYONE would be inform'd on this procedure and not "hidden" on internet message boards?? Again, I know you are thinking that I am just trying to pick a fight, but, no, I'm not. I've had "inside" contacts at the OLD and new OMC and it's just never been a "fix"!. I can see the reasoning in doing it but wonder ..... You know, I'm sure that engineering HAS done alot of testing on coking problems, it's been a big-time problem for all of the manufactures, why no directives for all the dealers??? Ok, just asking questions, I'll leave it alone now! Have a good day!!
 

Dhadley

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Re: Reroute telltale to top??

Here's where it all started - back in the early 80's a local Johnson dealer had a customer that burned the water cooled regulator / rectifier up with amazing regularity. All the little holes had been cleaned internally and even enlarged. We got involved because the service manager was a friend as well as a customer. And we were doing a lot of testing for OMC at the time. It was pretty well concluded that there was air being trapped at the top of the block and the reg/rec cools in water - not air (hot air to boot!). I looked for the highest spot in the water jacket to install some type of vent. The flat area right above #1 cylinder seemed like an easy spot so we tried it. We just T'd into the existing overboard line therefore not dumping any more water. Only so much goes out that hose and fitting no matter where you get it from. Well, it worked. The guy came back to the marina for the next couple of years and never had another reg/rec problem. <br /><br />In the meantime we were working on figuring out why the staroard side pistons carboned up before the port pistons. I'm sure you heard all the theorys about "directional rotational forces" and such. Well, to avoid another reg/rec burning on our test motor (we already lost one) we put the T in it and promptly quit carboning up the starboard side first. Now the pistons all carboned up evenly. And the block was the same temp on both sides. <br /><br />We made our yearly visit to OMC and that was one of the things we talked to the engineers about. On the record they said "It can't hurt" off the record they said to watch where the fitting is on the new motors (which turned out to be the loopers). It's higher but still not at the top. All my motors have the vent and I have never lost a water cooled reg/rec. I don't have a coking / carbon problem but thats because they all turn 5800-6000 (at least) unless we are doing a "severe load" test (4800-5000 wot rpm).<br /><br />Another thing we noticed as we vented the loopers - when you first crank a looper the overboard line spits air for quite a while. With the vent in line the spitting (before a solid stream) time is greatly reduced.<br /><br />As far as thermoststs go, there are a few things that can be done but I'd personally not do it to a stock motor that you didn't know where it's going. That's where the local tech expert comes in. I just talked to a guy near the Arctic circle and he certianly doesnt need help cooling the block! <br /><br />Now I'm rambling. Sorry!
 

waterdowg

Petty Officer 3rd Class
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Mar 6, 2002
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85
Re: Reroute telltale to top??

Can you tap above the #2 cylinder as well. If so is there a part number for that.
 

Dhadley

Supreme Mariner
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Feb 4, 2001
Messages
16,978
Re: Reroute telltale to top??

Yes I have seen motors that vented the port side too. You just put an additional L fitting in the block and T that line into the overboard line too. The OZ race motors were like that.<br /><br />Good luck!
 
D

DJ

Guest
Re: Reroute telltale to top??

Dhadley,<br /><br />Are you speaking of crossflows or loopers?
 

Dhadley

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Feb 4, 2001
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16,978
Re: Reroute telltale to top??

Yes. <br /><br />Sorry, I couldnt resist. Its been a long week. <br /><br />But yes, we have vented both crossflows and loopers. The OZ motors were loopers. <br /><br />Have a great weekend!
 

frog

Cadet
Joined
Aug 14, 2002
Messages
7
Re: Reroute telltale to top??

I have a 1998 j 150, would i benefit from this mod as well? if so do i need to tap the block as well( is the fitting threaded) I have noticed no heat problems, but before i went to full synth oil i noticed the starboard pistons had mor carbon on them. they are all clean and new looking now after a few gallons of synthetic oil.
 
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