Detroit Diesel 671TI Rebuild

Peter · Post by **Peter** » Mon Jan 03, 2011 12:06 pm

bummer,great post

alexander38 · Post by **alexander38** » Mon Jan 03, 2011 3:13 pm

And we lost all that info of King Pauly working on the 1st Godspeed with Capt. John Smith.

Audrey II · Post by **Audrey II** » Mon Jan 10, 2011 7:30 pm

I missed the two pages that were lost what is the status? Are you still making great headway? I have been very impressed with everything so far I can't wait to hear the results.

rossjo · Post by **rossjo** » Mon Jan 10, 2011 11:47 pm

Love to see some pix/video of honing the bores ...

Jerry · Post by **Jerry** » Tue Jan 11, 2011 11:49 am

I got a bit disgusted with losing the pics and comments but I will try to repost the lost pics when I can.
I ended up blowing out my back so the work on the boat came to a grinding halt.
I hope to get back on it this weekend if all goes well.

rossjo · Post by **rossjo** » Tue Jan 11, 2011 1:59 pm

sorry about posts, but reall sorry about your back. Been there, done that, had back surgery - now I'm VERY careful how I left.

Best of luck with your back and the engines.

Audrey II · Post by **Audrey II** » Tue Jan 11, 2011 7:32 pm

Very sorry to hear about your back. I too wish you were close I would love to help out and learn a thing or two. Keep us posted and get well soon.

captainmaniac · Post by **captainmaniac** » Thu Jan 13, 2011 12:19 pm

Sorry about your back... been there, done that. For me it only took 2 years of massage therapy and chiro to get things under control.

Slightly off topic but a couple of related questions to your rebuild : how many hours did / does the engine have on it, what kind of fuel consumption / burn rate were you getting, and what is the weight of the boat?

I am starting to get the itch to move onwards and upwards... the wife and I have been looking (at listings anyways) at some bigger boats, and some of them have mid-80's vintage Detroit 6-71TIs. I am certainly not a diesel guy, so looking for any info I can find to help educate myself. I have read a few different opinions re how reliable the TI series are given the high horsepower vs displacement (one post saying they need major overhauls every 1500 hours?), and I am trying to get a reasonable understanding of fuel consumption. The boats we are looking at are potentially in the 40,000 pound range.

prowlersfish · Post by **prowlersfish** » Wed Feb 09, 2011 8:14 pm

Any updates ?

Jerry · Post by **Jerry** » Thu Feb 24, 2011 9:45 am

Hello all,
It's been a rough past 6 weeks or so as my back is still giving me issues and I am having health issues with both of my parents so not much progress has been made with the engine.
I have been able to get the bores measured, honed, measured, honed and measured.
They cleaned up nicely and I only ended up having to go with .002 oversize kits so I was happy about that. They were also perfectly round so that was a plus.
Most of the parts are here now so the next step will be to do the final fitting on the sleeves, then pull them back out to load. We are going to fit them a bit tighter than they were from the factory.
Before installing them, I have decided to install new front and rear main seals along with new main bearings so I will get that done before the final install of the kits.
Hopefully, things will start to move along now. Summer will be here before we know it!

Jerry · Post by **Jerry** » Thu Feb 24, 2011 9:50 am

I forgot to mention,
Pretty interesting the way the pistons look. They are two piece design with a seal between the pieces.
There is a slipper bearing that goes on the lower part of the piston pin hole, and the connecting rod bolts to the piston pin with two small bolts.
I guess they can get away with that because these are such a low rpm engine.
I will post some pics so you can see what I am talking about.

Jerry · Post by **Jerry** » Sun Mar 20, 2011 8:28 pm

Here are a few pics of the air box cleaning.
This is the part of the block that gets the air forced into it through the blower. It then goes into the air box then through the intake ports in the cylinders.

It took a few cases of brake cleaner and a lot of time but they came out pretty well.

Jerry · Post by **Jerry** » Sun Mar 20, 2011 8:34 pm

Here are a few pics of the block honing.
It was a slow process but all went pretty well.

Here is the hone that we used.

A few pics of the hone in action.

Jerry · Post by **Jerry** » Sun Mar 20, 2011 8:39 pm

We did not have to take off much material at all and only ended up going .002 oversized with the liners.

Before honing

After honing

That was not the final hone, just a clean up to see how much oversize we were going to need to go. We had to clean it up to get an accurate measurement.

Jerry · Post by **Jerry** » Sun Mar 20, 2011 8:50 pm

All of the sleeves were fitted then removed. We will do the final install once we are done with the main bearings and front, rear main seals.

To get to the rear main, we had to remove the flywheel. It sounds easy but that thing is very heavy.
We unbolted the engine coupler and used two of the mounting bolt holes to bolt a bracket that we made. We then attached a strap type come a long to the bracket to support the weight once it was removed.
Here is a pic of the flywheel once removed.

We just kind of pulled it out of the way then tied it off.

Pic of seal in rear of engine