T&T: Tier II Diesels and Wiring Harnesses

[Dr. Gordon Anderson]

I have a John Deere Power Tech 6.8 Liter, 6068 SFM 50, Tier II Compliant and
love it.  We have been cruising in the South China Sea for over a year and
are yet to have our first problem.  No complaints about the wiring harness
as all of the extra jacks, plugs, sensors, etc. are tied up in neat packages
well out of the way.  You would have to be very clumsy to snag them.

The digital gage mounted on my dash board has worked flawlessly as well.  It
gives me a heads up on potential problems before they become a real problem.
For example, I got a warning that the vacuum on my Racor was reaching a
point where it needed to be changed on a recent passage.  Fortunately, I
have two in parallel so I just switched to the other one and kept going.

Tier II turbo charged engines are here to stay so you had better get use to
them.

Gordon


USMY Alchemy
Current Anchorage - Gold Coast Yacht Club,  Hong Kong
Email: alchemy@post.com
Blog:  http://usmvalchemy.spaces.live.com/


-----Original Message-----
From: trawlers-and-trawlering-bounces@lists.samurai.com
[mailto:trawlers-and-trawlering-bounces@lists.samurai.com] On Behalf Of Rich
Losch
Sent: Friday, June 15, 2007 7:23 AM
To: trawlers-and-trawlering@lists.samurai.com
Subject: T&T: Tier II Diesels and Wiring Harnesses

(was Holy Water Needed)
/
/Capt. Mike wrote,  ...."I have a new horror story today about
electronically controlled engines where the engine quit because one of
the connector plugs in a nearly new installation vibrated loose."....

It's an accident waiting to happen.  The Tier II John Deere #6068 TFM diesel
aboard our new boat is festooned with control wiring and cabling done up in
split loom conduit tacked on with cable ties.  Many unused multi-pin jacks
and plugs, not all of them test points, dangle freely from the harness.
Electrical sensors attached to the block and components have wires bedded
into them with no boots or strain relief.   A real large and ugly mess.

While this cabling design might be appropriate for trucks and engines in a
confined space or compartment, it has no place on a vessel where a person
working in proximity to the engine and can snag a wire, stress or break a
plugged connection, or cause damage that won't appear until the worst
possible moment.

I been told that the control wiring harness is a "universal harness",
designed for several engines, and that's why there's the extra jacks and
plugs and extra cabling that leads nowhere on my engine.   The universal
engine panel in the wheelhouse is no bargain either.

Well, I've asked and hope JD will sprinkle some Holy Water on the wiring
mess and square it away.  As it is, it ain't seaworthy.
The only product that John Deere doesn't stand behind is their manure
spreader, so I trust they'll make it right.

Anyone else in the same boat with Tier II engines?

Rich Losch
Rio Linda/ / KK48-37
Seattle
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