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Author Topic: Common failures / preventive parts replacements  (Read 41933 times)
GP
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« Reply #60 on: January 19, 2017, 11:59:32 pm »

If you already have a good camshaft and wish to keep it that way then check that the rockers operating the exhaust valves have oil feed holes in them (the inlet ones don't and they are often replaced incorrectly) and use a good quality oil and change it regularly.

An old article of mine..........
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roy4matra
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« Reply #61 on: January 20, 2017, 05:05:47 pm »

Fuse panel printed circuit board connectors. I did the remaining ones on my car recently and the I found that the Rover ones recommended by Roy are getting difficult to obtain.  In the end I got some from a Mini specialist (they are used to connect the ECU on Minis from 1989 onwards) and they said that there would be no more once the existing stocks were gone.  I have searched the catalogues of the major connector manufacturers (AMP etc) to no avail.

The AMP symbol on the original pcb indicates the board was made by Ampliversal but they don't seem to want to supply the necessary edge terminals for the plugs that connect to these boards, and currently Simon do not have any more of the copies he had made (although some may be coming later this year I hear) so I have been considering alternatives and improvements.

Quote
I think a lot of Murena owners would be very grateful to anybody who can recommend an alternative.

I have obtained some pcb connectors and plugs that would allow a conversion of the existing boards to get rid of the four plugs and the edge terminals that crack or break, cause so much trouble and are just about no longer available.  However, this first attempt has sort of failed as the plugs are too high to fit the pcb back into the carrier/surround plastic that is screwed into the bracket on the car.  It does work but the board would only be supported by the four wiring looms.

Since there doesn't appear to be any other plug and sockets small enough to fit in the space we have, I have decided the best alternative is to make the connections semi-permanent, much like say the fuse board wiring of an old 70's Porsche 911.  In other words, the connectors are soldered to the pcb and then you cut off the terminals and dispense with the plugs and the wire ends are screwed directly into these connectors.  This means it takes slightly longer to wire up the looms to the pcb and care has to be taken to fit all the wiring in the right positions, but after that the circuits should not suffer any poor contacts and loss of voltage.

Once I have the first board done I will write it up with photos and anyone struggling to get new edge terminals to replace broken ones will have an alternative that should actually be an improvement too.

Roy
« Last Edit: January 20, 2017, 05:08:49 pm by roy4matra » Logged

Murenanimal
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« Reply #62 on: January 27, 2017, 07:49:59 pm »

Hello,
Once in a while on the French "Leboncoin" selling site, there are NEW original circuit boards offered,
but usually around €100. You can keep then the original connectors.
In the French forum "Matrapassion" there is someone who builded a number of "new" circuit boards
with modern components for other members, but there were new type of connectors used.
He had to construct at least 10 boards to reach a price range there too about €100.
(Including his personal costs for labour).
So these are a couple of solutions otherwise available.
Hope this formation helps
Matranimal greetings from Belgium.
Guido
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roy4matra
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« Reply #63 on: January 28, 2017, 12:45:11 pm »

Hello,
Once in a while on the French "Leboncoin" selling site, there are NEW original circuit boards offered,
but usually around €100. You can keep then the original connectors.

Yes I know of the new boards as I have bought a number from Simon Auto, and they were good, but they are all gone, and maybe he might have some more made later this year, but they are expensive.  And the one main problem still remains - if the terminals in the plugs are broken, so the contact is reduced or lost (and often your get the pads burnt owing to arcing with those poor contacts) these terminals are now almost impossible to get, so what do you do then?

Quote
In the French forum "Matrapassion" there is someone who builded a number of "new" circuit boards
with modern components for other members, but there were new type of connectors used....

Guido

I have seen one of these and they are not that good in my opinion, and also cost a similar amount.  They put the relays on top of the board so you will not be able to fit the cover.  Relays don't need to be on top as they rarely fail, and in fact having them underneath means you can easily test them just by removing the fuse box cover as all their terminals are easily accessible on the top of the board.

This is why I was looking for a simpler and cheaper solution, which I now have.  I received some of the pcb terminal blocks I had ordered the other day.  I carefully drilled a series of holes in the pcb using a 1.2mm drill bit in my Dremel, and the terminal blocks can be inserted and soldered to the board.  These blocks have a screw so you can insert the wire from the loom and secure it.  Once you have all the wires attached you put the board back in its holder and mount it back in the bracket in the car.  Job done.

Now all the wires are fastened securely to the board, and the circuits are positive and don't have to rely on a spring loaded slide contact which is potentially poor.  The result is better connections using the existing board.  The cost?  Maybe £5 for the terminal blocks and a little work to drill the board and solder the terminals to it.  A couple of photos that show 1) the underside of the board with the terminal blocks fitted but before soldering the pins to the pads. (please ignore the wire on the board as this was a board with a burnt out track that had previously had a repair - I was using this board as my trial in case it didn't work)  And 2) the top of the board with the two terminal blocks fitted.  Another two would be soldered to the other side to replace the four slide on plugs.

One further point about this modification, in case you hadn't thought about it - you only need to change the plug with broken terminals for a terminal block if all the terminals in the other three plugs are still good.  So you can do as few as you need or do all four, it's up to you.

Roy
« Last Edit: January 28, 2017, 02:53:33 pm by roy4matra » Logged

suffolkpete
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« Reply #64 on: January 29, 2017, 10:55:56 am »

Nice work Roy.  Do you have a reference for the blocks?
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MatraIan
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« Reply #65 on: January 29, 2017, 04:41:21 pm »

What about this type of option easy to disconnect Huh
http://www.ebay.co.uk/itm/5-Sets-9-Pin-PCB-Mount-Screw-Terminal-Block-Connector-Socket-3-81mm-/232176405623?hash=item360ecacc77:g:6wEAAOSwImRYU73u
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Murena 2.2 S Red 1984
roy4matra
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« Reply #66 on: January 30, 2017, 11:52:04 am »


Hello Ian

These would have the same problem as the first ones I tried.  The blocks would fit and solder to the PCB fine, but the plugs are too high and when fitted would not allow the PCB to fit back into the surrounding holder to be fitted into the car.

Roy
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roy4matra
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« Reply #67 on: January 30, 2017, 12:08:52 pm »

Nice work Roy.  Do you have a reference for the blocks?

Hello Peter,

Yes they were bought from Rapid Electronics and they are made by CamdenBoss.  They are sold in blocks of two (CTB0500/2) or three terminals (CTB0500/3) but they interlock so you can make the blocks whatever length you require.  The Murena PCB has two 9-pin on one side and one 8-pin plus one 3-pin on the other. (although I am making that last one a 5-pin so there are more live take off feeds if required, since there is plenty of space on the PCB).

Now I have done the first prototype and made sure it works, I am about to place a large order for a 100 2-pin and a 100 3-pin blocks as the unit cost comes down and I can offer them to others to do themselves; or if they contact me first and the condition of the board is suitable, I can do the work for them.

Roy
« Last Edit: January 30, 2017, 12:15:11 pm by roy4matra » Logged

Murenanimal
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« Reply #68 on: February 03, 2017, 10:35:53 pm »

Creative thinking and keeping things as simple as possible, congratulations!
Fine continuation to improve the Murena's.
Greetings from Belgium
Guido
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