Detroit 6-71 Fuel Line size?

[Kerry Lebel]

Can anyone tell me the diameter needed for the fuel lines for the Detroit 6-71's? I want to finish up my electric primer pump and fuel polishing installs next weekend and need to know what size brass fittings I will need to buy.

Thanks,

Kerry

[Perry & Cindi]

1/2” MARINE FUEL hose for the feed and 3/8” for the return for either natural or turbo

Capt. Perry

 

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[Kerry Lebel]

Thanks for the quick reply.  Looks like I will be making a run back to the fitting ship.  I bought all 3/8" fittings and valves yesterday.  Doh!  By the way, I have the Detroit 71 service manuals and they dont list that anywhere that I could find.  You wouldn't have a list of the zincs for that engine too would ya?

Thanks,

Kerry

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[Perry & Cindi]

Look for zinc heads that take a 7/8” wrench. There may also be some smaller ones on heat exchangers

[Bohn, Steve]

capt perry how many zincs on chrysler 318's

[Perry & Cindi]

Sorry but I do not know

 

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[Monty Montaine]

Hey there Capt Perry, Monty here..I have 671s and just replaced my zincs after I had one, that I didn’t know about, break off just ahead of my impeller and destroyed my impeller ..our resident marine mechanic told me he sees this all the time and that it’s not that necessary to replace that on so I didn’t..that is my personal choice of course...just a heads up to that last zinc tube near the draw side of the raw water impeller.

Monty.

 

From: unifli...@googlegroups.com [mailto:unifli...@googlegroups.com] On Behalf Of Perry & Cindi

Sent: January-13-10 8:37 AM
To: unifli...@googlegroups.com

[Perry & Cindi]

One thing I can tell you is the pencil zincs on engines, raw water pumps and heat exchangers are very distinctive looking if you look closely. If they have never been changed they may be painted. When you find a head that looks different than a bolt head and sticks out a little and not flush with the surface it is on, scratch the paint off. If it is brass in color than it proberly is a zinc. You may also have several different sizes on your engine

Capt Perry

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[Perry & Cindi]

Hi Monty,

That zinc is a pain in the ass

On some stormy night that you are bored out of your mind and you need to change or inspect your impeller I would change it. Otherwise, what is one more thing wrong, HA, HA

Perry

 

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[Monty Montaine]

Exactly..lol

[Monty Montaine]

Actually I changed both and used plugs so that this never happens again...at first I thought I blew up my starboard engine and if you had seen the smoke coming out of the exhaust you would have thought the same..smoke was from the impeller..replaced them with no ill affect..all is well with no chance of that happening again.

[Kerry Lebel]

So you guys just pulled out those zincs all together and plugged it?  No side effects?

[Perry & Cindi]

No, No, you need engine pencil zincs in your engine.

Capt Perry