Detroit diesel 12v71TI no power out of the hole

Hi,

A strange phenomenon called wear can cause a loss of performance in any mechanical item.

It is gear driven and it is also what is known as a gear pump meaning it has a pair of normally spur cut gears in it, one is driven by the engine and the other one is driven by this one. They are lubricated by the pumped medium.

Would this be the same engine the flywheel fell off by any chance?

The relief valve might also be opening, you will know a lot more when you can determine what the fuel pressure is.

Hi,

I am not saying it did but vibration can and does cause strange wear on some parts of the drive rain and its accessories at times.

At this point, getting a trained DD mechanic out would be your most cost effective means of correcting the problem rather than simply pissing in the wind. There are several good ones in the Miami area.

Any updates?

Back seal is leaking a bit. The seal is lust like a well pump seal. I replaced mine with what redneck tools I have (nothing special).
If you're inclined, you can do it. No need to pull the whole pump, all you need to get at is under the front cover.

Plain white vinegar works well and is inexpensive.

FYI... We have electric distillers that makes several gallons a day from the regular potable water supply that has a tap in the galley... every boat every house every apartment... same. These were installed years ago after the ladies decided they did not like the idea of water sitting around in tanks "growing things" and "dead mice rotting in them" etc. wanted all the water for drinks "pure" and "makes thing taste better." This comes from the over eighty and over ninety set remembering cistern water... long story. No never mind on a boat the tanks are sealed... its that they are sure they are contaminated... and they are horrified that "bleach" would be added... ok to clean with it but add chlorine to drinking water... OMG." Anyway the systems use an electric boiler and a cooling coil and a small tank for storage... but it is stainless and easily accessible. The boilers alway have a scale problem. This used to be cleaned with a special cleaner... but it did not work well. So the "les mamah" discussed this came up with vinegar cleaning. It does work better and being a economical lot they figured out it could be saved a reused several times before it lost it effectiveness... which does not happen unless they are around.

This takes me back to my childhood and my grandmother and her sister and the "butter" great aunt Lee would have the staff throw out any butter that had been set out for anytime at all... "mice will have been in it" now perhaps this is a generational thing with those born in the late 1870s! It is darn hard to spread butter that is hard as a brick! Bread and "sliced butter" sandwiches!

No one has mentioned nor did you state why you went from a 4 blade to a 3 blade prop- or why you changed the exhaust path. If those were the only two changes shouldn't you be looking at those as a primary reason for initially better fuel use and poorer out of the hole performance? Sounds like you are now a bit overpropped if she doesn't want to get out of the hole.

Nuke it = soft spread butter.

Microwave the hard butter for a few seconds

or time required, depending upon microwave.

I can tell ya, but then I'd have to kill ya.
LOL

2 oz rum, 1/2" socket & ratchet, Small external snap tool. Long needle nose plyers. 2 oz rum, Long small flat tip screw stick, 2 more oz rum, Medium vice grips, long punch & mallet, 2 more oz rum (this time with mixer).

Reassemble in reverse order (if you can remember after all da rum).

,rc

Honestly, I'd put a reman'ed pump on. Most of the time when the seal leaks it's for another reason. A bearing going bad causing impellor wobble, etc. You can try the seal, but it's only a fix 40% of the time. It's not very hard to change the seal, just pay attention to how it comes apart, or get a diagrahm from the DD dealer you buy the seal from.

So, What did you decided / do?