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The Dieselfication of Coach 1046
Author: BigRabbitMan (Show all albums)

This album is dedicated to following the process of Coach #1046 being converted from a 1976 Chrysler 440-I with a 4spd Allison AT540 transmission to a 2006 GMC Duramax LBZ turbo diesel with a 6spd Allison 1000 double overdrive transmission. There is a companion discussion thread in the Mechanic's Corner section of the Forum area of this site.
Show Newest Photos First | Show Oldest Photos First379 Photos - Page : [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32]


Well, the sun came out and the snow melted and so the work continued. Now we have the driveline and other transmission connectors removed and switched to the inside of the cab.

At an elevation of about 25 feet, we retired to coffee inside the house. The interesting thing is that it only snowed on an area of about a 1 mile radius centered on Eric's house. We had our own cold, little cloud.

This is why we left the hood on the donor truck but we thought it would be rain and not snow. While I was gone, Eric quickly put the the tools and everything away.

When I returned, I found this!! This is Eric's coach #587. Now a litle snow doesn't faze 90% of you, but to us California flat landers, this is highly unusual and only happens about every ten years or so.


Here is another view. The cold air tube and air heater will be put back and it will angle down to the left over and in front of the tensioner pulley. We will need to file a small bit of bracket casting off at one point to ensure adequate clearance. At this point I left to get two new, slightly longer bolts for the lower two bolt holes.

Now you see the vacuum pump added to the bracket. It is a used pump. It's pulley is powered by the back side of the belt as the belt comes off of the bottom of the crank pulley and heads over to the bottom of the tensioner pulley. The belt will then travel under the lower ider and then up and over the first alternator and then back down under the second idler (that is a little higher and to the right) and angle up and to the right to the AC compressor. It then goes back down under a third idler and then up and over the second alternaor and on to the power steering pump and then straight across and slightly up to the fan pulley at the middle of the engine and then back over and around and under the crank pulley. Got it!!

Here is the new bracket slipped onto the studs that held the original bracket along with a bolt on the left. Anothe bolt will be added at the bottom. Note that the belt tensioner and lower idler are positioned higher on this bracket. This required temporarily moving the air intake tube out of the way to be able to slip the bracket over the studs.

Time to prepare to install the new, soft, cast aluminum bracket!


Yeah! After being sent the wrong bracket by the supplier, the correct new bracket has arrived.

This is a closeup of the area we will be working on. Note the intake air tube on the left that was fine to remove the original bracket. If you look closely near the bottom of this picture near the freeze plug, you will see a bolt hole that goes into the block and is rusty around it. This was not used by the original bracket, but the new one will extend further down and use this bolt hole.

A full view of the engine without the alternator and it bracket and attached idlers and tensioner.

This is the stock alternator and belt tensioner setup for all Duramax engines from 2005 and later. This is a 2006 LBZ. The 2002-04 LB7 engines had a mechanical vacuum pump which was no longer needed after those years. We will retrofit this area to include the pump so that we will have vacuum for the brakes.
Show Newest Photos First | Show Oldest Photos First379 Photos - Page : [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32]

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