Some of you may have noticed that I have been MIA for about 3 weeks. I had to go to the US for work for a couple of weeks, which stopped work on the Cad, however I did come home with a number of needed parts, which saved hundreds on shipping 🙂 Anyway, lets get on with it…….
Water Pump Pulley Alignment
As it says at the top…..sometimes you need to go backwards to go forwards.
I need to make a lower mounting bracket for the alternator. While checking everything in preparation, I noticed that the water pump pulley and the crankshaft pulley did not line up. The difference was about 3.5mm, which as you can see is significant.
After scratching my head for a while, I decided that I needed to remove the water pump and get some measurements. After comparing the old and new pump, I found that the pulley mount on the new pump had not been pressed far enough on to the shaft. Although the two pumps won’t necessarily be identical, you can see the difference below.
I also found that the heights of the bosses where the AC & Generator bracket mounts are incorrect. Fortunatley they are all too low, so I will be able to step them up with plain washers.
Unfortunately I don’t have a hydraulic press, so I needed to find another solution. I removed the back cover plate from the pump so I could support the shaft, and set up some steel blocks on the concrete to support the shaft.
I then used a large nut, a spark plug socket and a large hammer to carefully push the pulley mount on further until I achieved the correct dimension.
Once this was done I mounted the pump back on the engine to check the pulley alignment. This time it was pretty good. I then proceeded to re-install the back cover plate on the water pump. The gasket was a rubber one, so I made sure I didn’t do the bolts up too tight, however before I installed the gasket, I put a thin coat of Aviation No.3 on the metal surfaces to ensure the gasket seals 100%. All of the bolts had a bit of Loctite Threadlocker put on them to make sure they don’t work loose.
All I had to do then was mount the water pump back on the engine. Let’s hope this is the last time it needs to come off (I don’t have any more gaskets!).
Next job was to fabricate a new lower mount for the alternator. The original cast generator bracket can be used for an alternator, however it needs quite a bit of modification to get the bolt heads to clear the alternator casing, so I decided to fabricate a new one. I went to a local steel supply and picked up an offcut of 32 x 5mm steel bar.
The first step was to bend the bar at 90 degrees. Once I did this I cut the bar to length – this now gives me the basic shape. Some time on the bench grinder and in the vice with a file, and I have a bracket.
I now needed to reinforce the bracket because it does see some stress. I cut out a gusset to tie the flange to the base to lock it in. Now comes the fun part.
I have a new CIG MIG 135 welder which I haven’t really used yet. I set the welder up as per the instructions, and it welds like crap! After persevering for a while, I changed the settings by increasing both the voltage and wire feed rate, and it became a whole lot better. Unfortunately the welding on the bracket looked a bit awful, however I cleaned it up with the bench grinder and achieved a reasonable result.
I drilled the mounting holes and checked the fit. Despite the crappy welding, it turned out OK. Once the alternator is in place it will be hidden so nobody will ever know 😉
Fuel Pump Cover Plate
Next little job is to make a cover plate for the fuel pump mount. I won’t be using the mechanical pump as I have an electric pump to ensure a good fuel supply. I made a template and then used it to trace an outline onto a piece of 6mm steel out of the scrap bin at the steel supply.
I don’t have a band saw, so I had to cut it out the old way, using a hacksaw. After this I spent some time on the bench grinder cleaning up the shape. Once this was all done I drilled the two bolt holes and test fitted it. It looked great, so I finished cleaning it up and gave it a coat of primer.
Once the primer had cured, I mounted it as I don’t want to handle it once the top coat is applied.
I painted a couple of colour coats followed by a clear coat.