Nearly a year since my last post, and not a lot has changed. I’ve got a long list of things to do, and a box of parts to fit, but found I had zero motivation over winter to do anything in the garage; maybe that had something to do with the relentless rain that we were graced with. Now that the weather has improved (whoop whoop), the evenings are now lighter (double whoop whoop) and we’re all stuck in our homes with nowhere to go (not so much Coronavirus whooping), I’ve found some time to have a bit of a tinker.
First up was a bit of alternator / pulley action. I’ve never been too happy with either item on our van, but other than adjusting the fan belt, I’ve never really closely inspected either. The belt has always run a bit lumpy, and I noticed that the belt was wavering slightly in the pulley groove. Stripping it down, it looked like I’d caught it early as the pulley was starting to cut a groove into the alternator.
I bought a billet pulley to replace the cheapo one, but a new problem emerged. The billet pulley, being a more precision item, wouldn’t slot over the woodruff key. Close inspection revealed that the woodruff key was actually sitting at a slight angle in the alternator shaft. I wasn’t in the mood to start pulling it apart to replace the alternator, so my only option was to very carefully grind the woodruff key until the pulley fit. Slightly bodgey, but only intended to be a short term fix.
So with a new pulley on and a new Bosch alternator on back-order, Steve was usable again.
New alternator arrived and then sat in a box until now, when I’ve decided to pull my finger out and get fitting. However, not being content with just fitting this, I thought I’d give it a coat of satin black having been inspired by the look of some other efforts on here - Shane Marsh has a very cool looking engine 8) Something else that became apparent whilst removing the old alternator is that the shaft is not actually straight, or at least isn’t running true. My new billet pulley has been scuffing the alternator, but only in one spot. When looking down on the pulley and spinning it by hand with no belt on, there is a clear wobble to it. I’m hoping this has been the root of my problems and the new Bosch will cure this.
After asking on FB how to strip the alternator, or at least trying to understand if there were any components needing to be de-soldered, I realised I was largely wasting my time, and set about unscrewing things to see how far I could get. As it turns out, it was pretty straightforward, but I appreciate that I have completely voided the warranty by doing this. For anyone else who fancies giving it a go, here’s a kind of guide:
Remove the brushes. No picture of this, but it is the little black plastic cover on the top. Undo the 3 screws, gently lift the assembly out and disconnect the spade connectors as you do so to remove completely.
Remove the 3 screws on the front cover and slide off the shaft.
Flip the alt over and undo the 2 long screws holding the rear plate on. This gave me a bit of movement so I could see what was holding it all together. The little spacer on the shaft is a very tight fit, so I used a two-legged puller to remove the rear plate with the bearing. The inner rotating assembly can now be removed.
Next, the 4 screws on the inside holding the coils in place. This needed a bit of wiggling to slide it out. As it comes out, this gives access to the B+ post on the top of the alternator, which just needs the nuts removing before poking it through the casing.
All that leaves you with is the regulator(?) which is simply removed by removing the two screws.
Then a bit of masking and a bit of painting later, and a bit of bling for the engine bay! Assembly is even easier than removal as all the parts slotted together with just a bit of gentle tapping with an appropriately sized socket to reinstate the rear spacer.
Just need to get it fitted, but thinking I'll spray the alternator stand as well whilst it is apart.