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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #11  
Old 07-10-2008
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Originally Posted by RAGster View Post
Update on the Banjo...Tach sending unit.

I pulled the complete unit off the engine. The gearbox would rotate easily. Connecting the two banjo wires to a scope yielded nothing. Removed the Mechanical-to-Electrical transducer aka banjo (probably a coil). This unit would not turn freely. Removed the hex tube connecting the gearbox to the transducer and found the short cable was "stripped" in its holder. I resoldered the cable into the cable holder using a propane torch. I then used penetrating oil and a drill to loosen up the transducer. Then I lubricated the transducer. Re-assembled everything and tested with a drill and o-scope. Nice sine wave. Reinstalled and I now have a working tach.

It is clear that the tach transducer should be lubricated frequently (I recall someone saying about every 3k miles). There is a rubber boot on top of the transducer. Removing the rubber boot and placing some oil in the port should provide lubrication to the transducer. I not sure what oil would be best, but I would think that the 40wt we use in the engine would be fine. The oil will leak past the transducer into the gearbox and being the same weight as the engine oil would be compatible with the oil in the gearbox.

Glenn
Check out this LINK below to see if there is any information found there that could help our members in the future with this issue.

Wanderlodge Owners Group > Links, Files, Database and Downloads > Links Teleflex Marine Gauges
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  #12  
Old 07-10-2008
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John,

I did not see anything useful in a quick pass. The marine division products don't seem to match up very well. It does not appear that teleflex is still in the automotive market from the looks of their website.

Glenn
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  #13  
Old 07-10-2008
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John,

I did not see anything useful in a quick pass. The marine division products don't seem to match up very well. It does not appear that teleflex is still in the automotive market from the looks of their website.

Glenn

Take a closer look at this link Teleflex PDF Instruction Manuals there are instructions there that do relate to the sending units on a CAT 3208 engine, perhaps there may be one that is for a Detroit.
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I'M SO SLOW ON THE HILLS,THAT I GET TO SMELL THE FLOWERS AS I GO BY.....AND WATCH THEM GROW TOO!! NOT SO MUCH ANYMORE
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  #14  
Old 07-10-2008
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John,

Thanks for refocusing my glasses......

http://www.downloadingfiles.co.uk/te...0Generator.pdf

The linked document above is the Signaflex sending unit that looks like the one on the V92s. It is noted as having 8 pulses per revolution. Now I will try to find out more information on this unit and see if it is still available.

The ".104 square end drive tang" is the part that "stripped" on my unit. I resoldered the square cable to the drive tang and it seems to be holding for now. It would be nice to be able to purchase these parts too. I will see if I can find a source for the tang. Now I know what to call the drive tang....

Thanks for getting me pointed in the right direction.

Glenn
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  #15  
Old 07-10-2008
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It looks like this tach would work for the v92s by reading the specs...not sure about the cosmetics in matching the other guages.

http://www.downloadingfiles.co.uk/te...0Frequency.pdf

(8 pulses /rev) * (4000 rev / min) = 32,000 pulses / min

(32,000 pulses / min) / (60 sec / min) = 533 pulses / sec

So assuming a full scale of 4K rpm, that would result in a 533 Hz frequency.

The above tach is good from 133Hz to 1248Hz so it is a good fit by the specs.

Glenn
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  #16  
Old 07-10-2008
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This document has instructions for connecting the Signaflex Pulse Generator to the Low Frequency Tachometer.

http://www.downloadingfiles.co.uk/te...s/99281_R9.pdf

Glenn
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  #17  
Old 07-10-2008
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http://www.custominstrumentpanels.com/senders.htm

The link above has the Signaflex sending unit SND9604276 for $66.69. I don't know anything about the company and have never purchased from them.

Another link Go2Marine http://www.go2marine.com/product.do?no=92412F has them for $56.76

Offshore wake http://www.offshorewakemarine.com/in...roducts_id=921 $52.79

Glenn
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Last edited by RAGster; 07-10-2008 at 12:13 PM.
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  #18  
Old 07-10-2008
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heres a tip for you guys,when you need just a drop of oil,for the tach or for a door lock or a pad lock on a gate,just pull the dipstick out of the engine and let the oil on the dipstick drip into your lock or whatever.
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  #19  
Old 07-10-2008
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Glen you should lubricate the tach sending unit with grease not oil. MY tach just went out also but it was my fault. It first started an erratic reading and finally almost home the other day stopped entirely. Got to open up the under the bed hatch anyway to retension the fan belts on my rebuilt alternator and will do the tach then. It normally gives you a warning that it needs lubing by starting to give you erratic readings. But they are rugged and should not fail for a long time with the proper care.

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  #20  
Old 07-11-2008
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Tom,

I agree that grease would be better, but I don't think you can effectively get the grease to where it is needed. How are you getting grease into the sending unit?

Glenn
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