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Author Topic: Anciliary shaft bearings  (Read 2761 times)
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lukasdeopalenica
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« on: November 27, 2015, 03:08:29 PM »

I have some questions regarding these bearings:

1. Should they be replaced if the no. 2 conrod had a contact with the anciliary shaft lobe?
2. How their condition can impact oil pressure?
3. Is it possible to replace them without full engine stripping?
4. Should them be pre-sized to the shaft? I found such a statement at the midwestbayless web shop. Where can I source it in EU?

thanks in advance for your answers.

These bushings are often forgotten while engine overhauling, unfortunately.
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rossocorsa
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« Reply #1 on: November 27, 2015, 03:20:20 PM »

In general I believe they are difficult to source and need a special tool to fit so most stick with the originals.
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lukasdeopalenica
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« Reply #2 on: November 27, 2015, 08:33:55 PM »

They are available in the USA. Are they generally not prone to wear?
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rossocorsa
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« Reply #3 on: November 27, 2015, 08:39:02 PM »

Well I don't know but I think they have to be reamed to size or some such technique, I don't think GC usually changes them check with him
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HFStuart
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« Reply #4 on: November 28, 2015, 09:13:36 PM »

They are one of the first ports of call for oil leaving the pump. Heavy wear can lead to lower oil pressure.

They need special tooling to press into place and may need reaming to size after fitting.

I had mine changed because I got my block acid dipped. I was lucky, after pressing into place the bore of the bearings was exactly the right size so no reaming required.

Unless they are obviously damaged or well out of tolerance I'd leave well alone
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rossocorsa
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« Reply #5 on: November 28, 2015, 09:23:46 PM »

Some time back I did give GC an example of the reaming tool which had storage deterioration, I don't know if he cleaned it up and whether it achieved a GC standard for tools or ended up in the bin. If it was OK I imagine he should be able to changed them if really necessary.
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lukasdeopalenica
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« Reply #6 on: November 30, 2015, 09:16:15 AM »

That is one of the bearings suppliers:

http://www.midwest-bayless.com/p-1636-4269944-auxiliary-shaft-bearing-set-dohc-all-fiat-124-131-lancia-beta-scorpion-new.aspx

There is also an information that yhey are presized, whatever it does mean...
I am wondering it they are not damaged after contact ( even minor) of conrod with the fuel pump lobe.
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Lancia Beta HPE 2000i.e. '82 rosso corsa
SAAB 900i 16V Aero, '93 solid black
Subaru Outback 3.0R
Honda CB125 K6 '76 electric blue
Specialized Epic & Stumpjumper
WestonE
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« Reply #7 on: November 30, 2015, 09:52:17 AM »

Lukas

Inspect them first it is a full strip down serious machine shop job changing those bearings and they are rarely ever damaged unless the whole engine has had a major failure.

Good Luck

Eric
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mangocrazy
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« Reply #8 on: November 30, 2015, 10:15:59 PM »

Is it possible to remove the aux shaft without a full strip down? The reason I ask is that I'd really like to remove any possibility of mistiming that shaft and having lightning strike twice in the same place.
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rossocorsa
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« Reply #9 on: November 30, 2015, 10:48:23 PM »

yes if i recall correctly remove the pulley, unbolt the front casing and you should be able to slide it out but I'm not sure if there us enough space with engine in situ or not. might need to extract the little driven gear thats under the dizzy mount or blanking plate can't remember
« Last Edit: November 30, 2015, 10:56:38 PM by rossocorsa » Logged
mangocrazy
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« Reply #10 on: December 01, 2015, 01:00:46 AM »

The engine in question is out of the car, so access is not a problem. I'll have a think about this...
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
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lukasdeopalenica
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« Reply #11 on: December 01, 2015, 08:37:04 AM »

Good Luck

Thanks, I will do as you suggest
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Lancia Beta HPE 2000i.e. '82 rosso corsa
SAAB 900i 16V Aero, '93 solid black
Subaru Outback 3.0R
Honda CB125 K6 '76 electric blue
Specialized Epic & Stumpjumper
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