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Author Topic: engine wire springs/coils  (Read 214 times)

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mdidomenico

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engine wire springs/coils
« on: May 21, 2021, 06:41:56 AM »

i'm going to start the wiring on my engine soon, i noticed in pictures here and can recall before i removed all the wiring that several of wires had coils in them near the devices.  are these coils important or just strain/vibration relief?  if important, how do you get the wire to stay in a spring like shape?

i suspect these springs/coils are largely irrelevant, but i was curious, figured i'd ask
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1989 Cat34 #856, original m-25xp

Stu Jackson

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Re: engine wire springs/coils
« Reply #1 on: May 21, 2021, 10:00:22 AM »

i'm going to start the wiring on my engine soon, i noticed in pictures here and can recall before i removed all the wiring that several of wires had coils in them near the devices.  are these coils important or just strain/vibration relief?  if important, how do you get the wire to stay in a spring like shape?

i suspect these springs/coils are largely irrelevant, but i was curious, figured i'd ask

They are "...just strain/vibration relief."  Not irrelevant, but very useful.  Everything connected to the ngine vibrates, and alternator connections do so even more, like the tach and field wires.

Coil them up around a pencil, make them much longer than you think you'll need to offset any tendency to "unwind."  Practice on some samples first.
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

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mark_53

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Re: engine wire springs/coils
« Reply #2 on: May 21, 2021, 10:16:38 AM »

I don't have wire coils. Never had one come lose but if I did, I'd use a lock washer.  Wire is pretty flexible on it's own.
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1989 C34 Mk1 M25XP Danforth 25lb, adjustable backstay, fin keel, EV100 autopilot, CDH diesel heater

Ron Hill

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Re: engine wire springs/coils
« Reply #3 on: May 21, 2021, 02:26:32 PM »

Guys : Like Stu said they are for strain/vibration.  Those coils also act as a "service loop" with extra wire in that run.

They are VERY handy, because they give you some extra wire incase you need to put a new connector on the end.  I just use a wooden dowel to wind the wire around to get that coil! 

A few thoughts

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KWKloeber

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Re: engine wire springs/coils
« Reply #4 on: May 21, 2021, 07:38:12 PM »

Md

[edited]

When wiring different alternator optional models on Universals the terminals were in different locations and the harnesses werenít customized.  Leaving them a little long and putting the coil in there is a professional look rather than having them a little long and drooping, or worse a little tight. 
Itís one thing if youíre terminating each wire individually after pulling a harness, but if you pull a harness with the wires already terminated itís nearly impossible to get every one precisely to the correct length.  And then what if you change alternators?  Or the pigtail on  REPLACEMENT fuel pump is an inch shorter?  Butt crimp on an extension? NOT professional.

Theyíre no so much strain relief - theyíre strain prevention.

Are you making up a harness yourself?  What are you planning for fusing the harness? How are you powering the fuel pump and alternator field excite?
Are you wiring right to the panel or to a terminal strip?

Note that the OEM Westerbeke (XPA) engine harness was SAE stiff wire (and current engines STILL ARE not flexible Type 3 marine wire. So, the coils are a little more difficult to stay put on new (flexible) wiring than on the old (stiff) harness.

PS: thereís no such engine as an mxp-25a.
If you have an M-25XPA itís wired differently than the M-25 and M-25XP.
If itís truly an ďAĒ she has the convoluted wiring scheme (suggest you consider changing it WHILE youíre rewiring anyway.
ALSO, be mindful of the issue with the oil switch terminals on the A (and B) engines, and issue with the starter solenoid terminal  connection.
« Last Edit: May 21, 2021, 10:01:39 PM by KWKloeber »
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mdidomenico

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Re: engine wire springs/coils
« Reply #5 on: May 22, 2021, 06:13:17 AM »

Are you making up a harness yourself?  What are you planning for fusing the harness? How are you powering the fuel pump and alternator field excite?
Are you wiring right to the panel or to a terminal strip?

PS: thereís no such engine as an mxp-25a.
If you have an M-25XPA itís wired differently than the M-25 and M-25XP.

If itís truly an ďAĒ she has the convoluted wiring scheme (suggest you consider changing it WHILE youíre rewiring anyway.
ALSO, be mindful of the issue with the oil switch terminals on the A (and B) engines, and issue with the starter solenoid terminal  connection.

all good questions.  i'm starting from total scratch so the world is my oyster.  hopefully i can do it correctly.  over the next couple of weeks i'll likely be starting a few threads on the issues/clarification (fusing is one i plan to start with).  i'm working my way through all the engine electrical threads, some of it's hard to follow and buried in multiple threads, so it's taking a bit to digest it all

i put the engine moniker in my sig before i knew anything after just getting the boat.  i'm pretty sure it's an m-25xp.  unfortunately most of the stickers peeled off before i got her and when the yard painted the engine last fall they scrapped off what remained.

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1989 Cat34 #856, original m-25xp

Ron Hill

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Re: engine wire springs/coils
« Reply #6 on: May 22, 2021, 09:17:16 AM »

mdid : I'm sure that you have a M25XP engine made by Medilest in Oshkosh.
 
Just make sure that you use marine grade (tined) wire and a good grade of connectors like a name brand - Blue Sea or Anchor or Cole Hersee - to name a few.  Also a good grade crimper will help.   
Don't do like someone I saw - he got great deal on a roll of green marine grade wire.  You guessed it - all of his wiring was green!!   :shock:

A few thoughts 
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KWKloeber

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Re: engine wire springs/coils
« Reply #7 on: May 22, 2021, 09:53:20 AM »

Telltales:

The engine displacement is embossed onto the block, above/behind the secondary fuel filter:
855cc = M25
927cc = M25XP or XPA or XPA(C)

Does your fuel return line come off the front of the engine (cyl #1 injector banjo) or rear (#3 injector banjo)?

Is your oil pressure alarm switch on the block, above back end of the starter (one wire running to it)? = M-25 or XP.
Or mounted to a plate attached to the unused port side engine mount holes (two wires running to it)? = XPA or XPA(C)

Is there a preheat solenoid and push button circuit breaker mounted aft end of engine, stbd side? = XPA or XPA(C)


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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
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Ron Hill

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Re: engine wire springs/coils
« Reply #8 on: May 22, 2021, 04:43:00 PM »

Ken : I don't know of a C34 that Catalina made that didn't have a Medalist M25 or M25XP engine.  I believe the same holds true for the C36s.

A thought
 
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KWKloeber

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Re: engine wire springs/coils
« Reply #9 on: May 22, 2021, 06:57:54 PM »

Ken : I don't know of a C34 that Catalina made that didn't have a Medalist M25 or M25XP engine.  I believe the same holds true for the C36s.

A thought

Ron

Your point escapes me. Weíre discussing whether the engine is an m25, an XP, an XPA, or an XPA(C).  Are you saying the latter two were never installed in a 34?
« Last Edit: May 22, 2021, 06:58:23 PM by KWKloeber »
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

Ron Hill

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Re: engine wire springs/coils
« Reply #10 on: May 23, 2021, 12:55:38 PM »

ken : The only 2 "M25" engines that I know of that were installed in a Mk I C34 were the M25 and M25XP.   Later in the MK I they installed the M35 and in the MKII the M35BC engine.

A thought
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KWKloeber

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Re: engine wire springs/coils
« Reply #11 on: May 23, 2021, 07:19:23 PM »

ken : The only 2 "M25" engines that I know of that were installed in a Mk I C34 were the M25 and M25XP.   Later in the MK I they installed the M35 and in the MKII the M35BC engine.

A thought

Ok gotcha. Thx for that heads up Ron.
Mike Brown has a 35A (dunno if itís original.).

So if there were no XPAs installed it seems that MD doesnít have an xpa.

Ken
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain
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