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Old Jun 7 2021, 12:07 AM   #5858
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Join Date: Mar 2013
Location: Milton Keynes

Fan of: Dragonsdawn
Now Reading: Working my way through the whole Pern series
Default Re: What is happening

Originally Posted by P'ter View Post
You could leave the soffits and claim they're bird boxes?
Sadly leaving a gaping hole into the attic sounds like a recipe for disaster! We've enough issues with water ingress in this house as it is. It'll need to be sorted...just really could have done without yet another £5-7000 bill this year.

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After over two months thanks to problems with shipping due to Brexit related nonsense the new oil pressure switch for the Invacar arrived last week. This afternoon I figured I'd get that fitted in the hope that it cures the minor oil leak from the rear of the engine... I'm not holding my breath as I reckon it's only half the issue, the other source being the crankshaft oil seal. Which is a pain as that's an engine out job to change. If it is the crankshaft oil seal though I'm not going to lose too much sleep over it given the leakage is very slight - one or two drops when the car is parked up. If it was losing any appreciable amount while driving it would have shown up given how small the sump capacity is, but she's never used any between changes so I'm not too worried. Knowing that the pressure switch was visibly weeping though I wanted that changed. That's the sort of leak which can go from very minor to catastrophic with little or no warning.

Getting the old one out is actually deceptively awkward due to the proximity of the distributor and oil filter. Not enough to be a problem, but just enough to be moderately annoying.

Eventually managed to get a spanner onto it (24mm) with the oil filter removed. Then discovered quite how tight it was. When I started to pull the car over the wheel chocks I instead opted to remove the boss that the pressure switch is threaded into, allowing me to separate the two off the car.

That let go with an almighty crack which rammed my arm against the engine cover slam panel. This car has drawn blood surprisingly few times during the restoration project but she managed today!

Didn't actually realise I'd done that at the time, it was about ten minutes later when I had that "wait...where is this blood coming from?" moment.

Annoyingly it then quickly became apparent that my new pressure switch is completely wrong, despite having been bought from a Steyr-Puch specialist. The different case style is immaterial - however the thread and threaded length of the body are also totally different.

The length is actually important as the oil pressure relief valve spring sits against the underside of the pressure switch body so the depth it screws in is critical to the preload being right.

At least since I ordered that the actual Bosch part number (0986344041) has been tracked down so I have now got one on the way. Just annoying that I've wasted a lot of time on this - and that the £7 sensor ended up being north of thirty quid by the time shipping and all the tarriffs and fees were paid...only for it to be the wrong thing.

On a slightly lighter note though I had a nice addition that had been on my wish list for a while arrive for the calculator collection a couple of days ago. This was spotted by someone over on UKSaabs who kindly offered to collect it and post it on to me.

I'd been after one of these for a while but refused to pay the frankly ridiculous sums of money they generally seem to change hands for.

This is a HP 12C Calculator - a specialised model intended for the financial market - and a fascinating case of the "if it ain't broke, don't fix it" approach. You'd think looking at this that it's a late 70s, maybe very early 80s model, even then a really late example of a calculator that uses RPN (note the large enter key and the lack of a separate equals key).

The 12C was launched in 1981, the RPN input scheme being maintained because it's particularly well suited to financial calculations, despite the rest of the world having moved on by that point. It gets even more surprising can STILL buy the 12C today, in 2021! Yes there have been numerous changes "under the hood" over the years, but the fact that a piece of electronics (even quite a specialist one) equipment has a model run of forty years and counting is frankly remarkable if you ask me.

This example appears to date from early 2001 judging from the serial number.

Quite how specialised this really is though is made most apparent by the manual.

You'd think to look at that it would be about thirty pages in English and then repeated in about 357 other languages...nope. That is all English, all 246 pages of it.

It feels like a proper quality instrument in a way that calculators just generally didn't by the time the 21st century rolled in. The keypad action in particular is lovely, you can tell that exactly the weight required to press the keys was designed in, it did not just happen because those were the switches they had in stock.

Being such an anachronistic oddball it's definitely one I'm really glad to have in the collection. Surprisingly enough it's actually the first pure RPN calculator I own! Not quite sure how it's taken me so long to get hold of one.
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