Aircooled knocking.. Now top end Rebuild

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Davegrohl99
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Aircooled knocking.. Now top end Rebuild

Post by Davegrohl99 »

After a recent trip home it developed this noise.

I drive it yesterday no knocking at idle when started drive for 20 min came back to this.

Any ideas would be great.

2.0 CU engine.

https://youtu.be/zQINoToktV8

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Last edited by Davegrohl99 on 05 Aug 2020, 13:59, edited 1 time in total.

Jackrobbo
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Re: Aircooled knocking

Post by Jackrobbo »

That doesn’t sound great. I know mine knocked 2.0cu when it’s been left a while to do with the hydraulic rappers losing pressure. Maybe worth checking the valve train.


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Davegrohl99
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Re: Aircooled knocking

Post by Davegrohl99 »

I was on a trip over the weekend and it never missed a beat. 5 miles from home this happened.

I added about 300ml of oil and drove home slowly.

Yesterday I started it up and no problems or knocking.

It is slightly leaking oil but I manage the oil level and check start of each day. It's not gushing out put noticable after say 500 miles driving.

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davidoft1
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Re: Aircooled knocking

Post by davidoft1 »

How much oil is in it , sounds big end maybe

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Davegrohl99
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Re: Aircooled knocking

Post by Davegrohl99 »

Its half way between empty and full on the stick..

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Stesaw
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Re: Aircooled knocking

Post by Stesaw »

Nice Aircooled diesel you have there.

I probably wouldn't drive it til you get that sorted. It's not going to go away, will no doubt get worse. 
1985 LeisureDrive 1.9DG 5 Speed

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tobydog
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Re: Aircooled knocking

Post by tobydog »

When did it last have an oil change and with what oil?
Knowledge is power
1970 CU

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Davegrohl99
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Re: Aircooled knocking

Post by Davegrohl99 »

Less than 1500km full service with just standard 20W50 mineral oil from Brickwerks.

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sarran1955
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Re: Aircooled knocking

Post by sarran1955 »

Hello,

You have a PM

Cordialement,

:ok
Help and advice on Aircooled engines here:
http://www.youtube.com/user/sarran1955/videos?view=0" onclick="window.open(this.href);return false;

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Davegrohl99
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Re: Aircooled knocking

Post by Davegrohl99 »

I'm going to drain the oil and inspect for metal,cut the filter open and inspect. I'll check the rockers after that.

Looks like camping is over for the year



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Davegrohl99
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Re: Aircooled knocking

Post by Davegrohl99 »

So after trying to adjust the tappets found that it was completely locking between TDC and 180 degrees.

The decision was made to drip the engine and in fairness 1 hour had her in the back if my van.

Maybe a blessing in disguise as the clutch was drenched in oil. Rear main seal must be caput.

Any who time to take the heads off see what's happening and replace anything perishable.

ImageImageImageImageImageImage

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sarran1955
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Re: Aircooled knocking

Post by sarran1955 »

Hello,
If it really won't turn over....

Then we are looking at a dropped valve... :(

Cordialement,

:ok
Help and advice on Aircooled engines here:
http://www.youtube.com/user/sarran1955/videos?view=0" onclick="window.open(this.href);return false;

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937carrera
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Re: Aircooled knocking

Post by 937carrera »

Davegrohl99 wrote:
11 Jul 2020, 13:24
So after trying to adjust the tappets found that it was completely locking between TDC and 180 degrees.

Was the dizzy still installed ?

if not then it could be the dizzy drive gear causing that problem as they try to rise up the shaft.
1981 RHD 2.0 Aircooled Leisuredrive project, CU engine
1990 RHD 1.9 Auto Sleeper with DF/DG engine

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Davegrohl99
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Re: Aircooled knocking

Post by Davegrohl99 »

We have a winner Image

Looks like the valve guide decide to part ways and played a game of ping pong with the piston and head.

Also when taking the heads off a hydraulic tappet just fell out?

Enough torture for one day so the next question is what to do.

I want to keep the camper original but would like a little more power and seen as it's all apart what does everyone recommend?

Keep stock and put back to OE or are there any modifications worth doing ie larger pistons or the likes that anyone recommends?

ImageImageImageImage

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sarran1955
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Re: Aircooled knocking

Post by sarran1955 »

Hello,

Looks like you are going down this route... :)

viewtopic.php?f=37&t=169431

You have dished pistons, so low compression, 95 RON petrol...

Definately not worth oversize pistons and barrels...

Air-Cooled Bliss.. 8)
 
Help and advice on Aircooled engines here:
http://www.youtube.com/user/sarran1955/videos?view=0" onclick="window.open(this.href);return false;

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