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Author Topic: Modestine  (Read 217867 times)

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Dilambdaman

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Re: Modestine
« Reply #75 on: 23 June, 2009, 10:18:02 PM »
Well, another 8 hours, this time with son Jonathan and still no nearer solving the problem. Investigated inside of the bell housing with Jonathan's Fire Brigade Search and Rescue fibre optic camera, amazing what you can see! Sump off, faced off the heads of the flywheel bolts as they seemed to be running very close to the rear of the block and checked conrod to cylinder liner clearance. Ran the engine having removed push rods on each cylinder to see if valves were the problem. Head off, camshaft out but all looked fine.

Re-assemble now and run again. Think that I'll trailer her to the AGM so that you can all have a listen! Bring your overalls!

Robin. 
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Robin Lacey 3222

1932 Dilambda
1992 Y10 GTie
2012 Delta Mk3
2013 Ypsilon 846

JohnMillham

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Re: Modestine
« Reply #76 on: 24 June, 2009, 07:29:22 AM »
I'll bring my stethoscope - but I expect you have tried one already! Regards, John
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DavidLaver

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Re: Modestine
« Reply #77 on: 24 June, 2009, 08:01:55 AM »

The other thing to bring is the ever longer list of what you have tried.  I can imagine you standing there all day saying "we checked that and..."

David
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David Laver, Lewisham.

ColinMarr

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Re: Modestine
« Reply #78 on: 24 June, 2009, 08:03:28 AM »
Robin,

Just to encourage you. It looked like this (see below) two and a half years ago, and I didn’t hear any clonks then!

Colin
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Dilambdaman

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Re: Modestine
« Reply #79 on: 27 June, 2009, 10:14:14 PM »
Thanks John, David and Colin for the encouragement.

David Mead (Augusta) came over for much of the day but sadly went away as baffled as I am.

On the bright side, excellent oil pressure following attention to the relief valve. :)

Robin.
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Robin Lacey 3222

1932 Dilambda
1992 Y10 GTie
2012 Delta Mk3
2013 Ypsilon 846

JohnMillham

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Re: Modestine
« Reply #80 on: 28 June, 2009, 10:06:46 AM »
Was the relief valve spring too weak? Or was the valve not seating properly? Did you check the pressure with hot oil? I ask because I'm a bit baffled about the pressure on my Augusta. When cold, it's a bit too high. This is not such a bad thing as it encourages me to warm the motor up slowly. But I tried a weaker spring in the top relief valve, only to find that it effected the pressure when the oil was hot as well, resulting in about 10 psi less pressure at cruising speeds. I have reverted to the old spring and remain confused!Regards, John 
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Dilambdaman

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Re: Modestine
« Reply #81 on: 28 June, 2009, 09:58:02 PM »
John,

I'm not sure if the relief valve is the same on the Augusta as on the Dilambda which is a piston in a sleeve with a conical seat held in place by a spring. There appears to be no adjustment other than the strength of spring used.

Morris Parry told me that he has had problems with the similar set up on his Augusta and that I should lap the seat in using valve grinding paste. I fitted a long bolt through the piston which allowed me to use an electric drill to do the lapping.

The piston also has a small hole across it which can get blocked or indeed some people deliberately block it off in the mistaken belief that it will increase oil pressure. The presence of the hole defies logic but is necessary.

I'm now getting 3 on the gauge when cold and between 1 & 2 when hot.

Robin.

 
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Robin Lacey 3222

1932 Dilambda
1992 Y10 GTie
2012 Delta Mk3
2013 Ypsilon 846

Dilambdaman

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Re: Modestine
« Reply #82 on: 03 July, 2009, 10:27:34 PM »
Addendum  to my last post re the oil pressure relief valve.

In case anyone thinks that Morris was encouraging me to introduce grinding paste into the engine block let me explain.

In many vehicles the piston of the pressure relief valve seats directly into the block - not so the Dilambda. The piston runs in a cylinder both of which come out of the block. So, I was able to grind the piston seat into the cylinder whilst holding it in my hand well away from the engine. Careful and thorough washing away of the paste is easy before re-assembly.

Robin.
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Robin Lacey 3222

1932 Dilambda
1992 Y10 GTie
2012 Delta Mk3
2013 Ypsilon 846

Dilambdaman

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Re: Modestine
« Reply #83 on: 03 July, 2009, 10:38:49 PM »
Progress at last - but don't get too excited!

Managed to get the Dilambda to the MOT garage and was rewarded with a shiny new certificate.

That's the good news, the bad is that the engine malady still persists, if anything, worse than ever. Driving the car has revealed that one can to some extent control the frequency and intensity of the noise and that it does seem more random than at first thought. It almost seems that there is something loose inside.

So, trailer is hired and hope to see you all at the AGM when a substantial reward is on offer for the correct diagnosis!

Today's very short drive served to remind me of how very much I'm missing using her.

Robin.
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Robin Lacey 3222

1932 Dilambda
1992 Y10 GTie
2012 Delta Mk3
2013 Ypsilon 846

chugga boom

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Re: Modestine
« Reply #84 on: 03 July, 2009, 11:07:57 PM »
look forward to your visit robin,
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1935 augusta lusso (chugga)
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fay66

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Re: Modestine
« Reply #85 on: 03 July, 2009, 11:57:04 PM »
Will I need my ear trumpet ;D

Brian
8227 8)
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Dilambdaman

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Re: Modestine
« Reply #86 on: 05 July, 2009, 11:14:03 PM »
Bakelite cover for the dip switch.

Picture shows the broken cover that I have. The missing part has a knurled knob on the opposite side to the one shown.

Long shot I know! Or perhaps someone knows how I can fabricate the missing part.

Robin.

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Robin Lacey 3222

1932 Dilambda
1992 Y10 GTie
2012 Delta Mk3
2013 Ypsilon 846

Dilambdaman

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Re: Modestine
« Reply #87 on: 06 July, 2009, 10:00:05 PM »
Quote from: fay66 on 03 July, 2009, 11:57:04 PM
Will I need my ear trumpet ;D

Brian
8227 8)

Ear plugs more like!

Robin.
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Robin Lacey 3222

1932 Dilambda
1992 Y10 GTie
2012 Delta Mk3
2013 Ypsilon 846

sparehead3

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Re: Modestine
« Reply #88 on: 07 July, 2009, 08:58:37 AM »
This will be a good test as to who is reading the Forum then ... check out the size of the crowd round the car :)
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Regards,
Steve Pilgrim

DavidLaver

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Re: Modestine
« Reply #89 on: 07 July, 2009, 10:09:35 AM »

That car with the bonnet open would pull a crowd ANYWHERE.

David
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David Laver, Lewisham.
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