Detroit Diesel 671TI Rebuild

Jerry · Post by **Jerry** » Tue Dec 14, 2010 9:45 pm

I just thought I would post a couple of pics to show the progress of the rebuild that I am in the process of.
If there is interest, I will keep posting through the rest of the job.

Here is the start of the actual engine work. It took about a week just to get to this point as the salon had to be emptied, then the carpet and most of the padding had to come up and the floor panels and braces had to be removed.
All of the floor had to come up as the one brace left that you see in the pic is what everything else is supported off of and that brace must come out as it is just about an inch above the rocker cover.

Jerry · Post by **Jerry** » Tue Dec 14, 2010 9:52 pm

This pic is after about 50 total hours of work.
I have a good friend helping me and we each have 25 hours in to the actual work thus far.
To this point I have taken about 400 pics and I have a note book that I right down everything we do and make any necessary notes.
I take pics before we remove something and more once the part is off.
I am glad I have help as I could not lift most of this stuff myself.

At this point we have started to fabricate the lifting frame in the shop as the engine is about ready to be lifted.
Once that is done we will take it to the boat and put it all together.

alexander38 · Post by **alexander38** » Tue Dec 14, 2010 9:56 pm

Keep'em coming. You bet we want to see'em.

rossjo · Post by **rossjo** » Tue Dec 14, 2010 10:48 pm

Making good progress.

prowlersfish · Post by **prowlersfish** » Tue Dec 14, 2010 10:59 pm

A lot of work , we had to strip one down last year to get it out the salon door .(cleared by a 1/2" or less ) Could not do a in frame as we had a hole in the block.

RWS · Post by **RWS** » Wed Dec 15, 2010 5:53 am

Yes, we're interested in th eproject, your comments and progress.

Need a you tube video with sound on startup.

RWS

Jerry · Post by **Jerry** » Wed Dec 15, 2010 8:51 am

I do have a friend that is a fiberglass guru that said if need be, we could cut under the side window and get the engine out.
That would be an absolute last resort as these engines were designed to be rebuilt in the field as long as there was not any block damage.
The engine looks a lot smaller now that most everything has been taken off and I bet if I could find some sort of a truck with an articulating arm, we could get it out.

That is a great idea about videoing the startup. You can bet that I will do that.
I just love the way these old Detroits sound at start. I get a lot of comments about it.
It will be nice to be able to start it up without the smoke blanket enveloping my club.

jddens · Post by **jddens** » Wed Dec 15, 2010 10:48 am

Great pics, big project but looks like you guys know what you're doing......thanks for sharing..........John

LandVF36 · Post by **LandVF36** » Thu Dec 16, 2010 12:35 am

Contacdt a local shop that rebuilds engines or a local electrical contractor. Most seem to know a "guy" that has a boom truck with a "cherry picker" type bucket that lineman use. The buckets can be removed and they clip on a big eye hook and chains to hold your engine. I've seen it done a few time. Once when the boat was tied up to a sea-wall and still in the water.

Jerry · Post by **Jerry** » Sun Dec 19, 2010 7:26 am

We decided to pull off the head today instead of working on the lifting frame.
I figured it would lighten the load that much more that we have to lift.

The head weighs well over 200lb and just to move it from the engine to where you see it in the pic was quite a chore.
As we lifted it, oil started to run out all over. It was on our hands, our feet, our pants and all over the floor that we were standing on.

I have never seen a worse oil than used 2 stroke diesel oil.

Jerry · Post by **Jerry** » Sun Dec 19, 2010 7:37 am

Once the head was off, we decided to see just how hard it was going to be to get the sleeves out.... That and I wanted to see if there was any number or size stamped into them.

Since I am not reusing the sleeve or piston, I placed a brass drift just into the intake ports when the piston was all the way down in the bore, then slowly turned the engine over with a wrench.
As the piston came up. it sandwiched the brass drift against the ports in the sleeve and lifted the sleeve up.

We did this to all the sleeves to make sure we were not going to have an issue getting them out.
When they all came loose we then pulled one all the way out.

Jerry · Post by **Jerry** » Sun Dec 19, 2010 7:46 am

As you can see in the pic, I am not too impressed with the fit of the original sleeves as there are very large high and low pressure areas on each one.
I think they should have taken more time to get a better fit. This could have been a very large contributing factor in the piston rings losing there tension.

There are some of the areas of the sleeves that are much worse than what is shown in the pic.

Fitting the sleeves will be the most technical and time consuming part of this job.

k9th · Post by **k9th** » Sun Dec 19, 2010 8:57 am

Great photos. Thanks for posting them.

rossjo · Post by **rossjo** » Sun Dec 19, 2010 9:34 am

I juts wish I had that much room in my engine "room".

The F32 gets tight with 2 diesels (at least they're inline 6 Cummins) and a generator stuffed in it.

Fired them up Friday for a while - both engines always start in <2 seconds.

RWS · Post by **RWS** » Sun Dec 19, 2010 10:32 am

All of the "problems" aside, there is something to be said for the simplicty of the 671 engine.

How many other engines would qualify for this kind of in chassis rebuild.

My Yanmars are wonderful, but if something bad happened, the whole engine complete would have to come out.....

So...

don't cry over spilled oil....

RWS

damn, I am so funny !