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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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123 DistributorViews : 2148 Replies : 33Users Viewing This Thread : |
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Oct 1st, 2020, 07:39 | #1 |
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123 Distributor
I posted this on the 140 group but haven't had any replies yet.
I have inherited a 123 distributor(switchable) on my 145 but have no experience of them before. On inspection it seems to have a lot of free rotational play, some between the rotor arm and shaft, and some between the aluminium disc that holds the magnets and the shaft. Combined I would say about 5 degrees or more, and not sprung so it's just 'slop'. The aluminium disc is a very loose and sloppy fit on the shaft and there seems no way of tightening it. So my question is, can anyone with experience of these distributors confirm if this 'normal' or not please. |
Oct 1st, 2020, 10:51 | #2 |
arcturus
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I have one on my 140 and the alu' disc does seem "sloppy" As long as the "slop" is only rotational,that's the way it's meant to be, it should be OK what you don't want is too much "slop" at the shaft where it engages with the cam. Are the dogs worn? they are not central but slightly offset from the center line.Hold the top of the shaft,where the rotor arm fits and the bottom of the shaft where it engages the drive and wiggle it in the body to see if there is play.
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Oct 1st, 2020, 11:07 | #3 |
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Thanks for that input, 'dogs' seem fine. Not sure what you mean with regard to the cam, obviously no points so no cam lobes on the shaft. I would expect that much movement to oscillate under some conditions and have some effect on timing. There doesn't seem to be any reason why it needs to be designed to have so much free movement.
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Oct 1st, 2020, 17:50 | #4 | |
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Quote:
Some (all?) of these rotors have a resistor embedded in the rotor connected between the center contact and the moving contact. The purpose or the resistor is to help suppress electromagnetic interference (EMI). There have been reports of this resistor failing in a catastrophic manner which in the best case just results in the engine stopping. Carefully examine your rotor for damage and try to determine why the rotor is a loose fit. My recollection of the original Bosch distributor on my B20 ewas that there was a spring clip inside the rotor that made it a pretty tight fit on the shaft. Definitely no play. I think the slop that Arcturus is referring to is the clearance between the drive gear on the camshaft and the gear on the end of the distributor shaft. |
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Oct 1st, 2020, 19:53 | #5 |
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Ask Rob? Presumably he fitted it?
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Oct 1st, 2020, 22:27 | #6 |
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More accurately, I should have said where the fixture on the end of the distributor shaft engages the offset slot on the oil pump drive gear.
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Oct 2nd, 2020, 08:04 | #7 |
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142Guy; All the play I'm referring to was established with the distributor removed from the engine. It's a combination of play between the rotor arm and shaft, and between the aluminium disc and the shaft. There is no name on the rotor arm but the cap is a Berhu.
Morwenna240; I think this was fitted by the owner before Rob. |
Oct 2nd, 2020, 11:18 | #8 |
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Umm. In that case i'd incline towards taking a little video of you waggling the shaft an send it to the 123 guys and ask their esteemed opinion.
I'd be interested to know about 123's longevity/quality control as am thinking of fitting one to my 145 an poss PV. Last edited by morwenna240; Oct 2nd, 2020 at 11:21. |
Oct 2nd, 2020, 11:37 | #9 |
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M240 yes I might do that but thought knowing how many people on here have fitted them I wanted to establish if these 'symptoms' are typical of these distributors even when new. But having said that it made me think, how many people consider them to be 'plug and play' or 'fit and forget'? Never bothering to look inside again.
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Oct 2nd, 2020, 12:23 | #10 |
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I've had mine in and out dozens of times to change curves (it's an older model) but i can't answer your question re play as I have never looked for it. All I know is that my 123 has been 100% reliable since the day I fitted it over 8 years ago, and the car has been used every day since. It is a 5 minute job to put in/out, so maybe whack it in and see if it's working to your liking.
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