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Broken Valve Springs Diablo GT / VT 6.0 and Murci might be affected too


rambointhegarage
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Hi,

 

a good friend of mine had to rebuild the engine of his Diablo GT recently as it didn't run properly. It turned out that one cylinder was sucking in coolant due to a leak in the cylinder head gasket. However that was not the only thing which was broken: More than 12 valve springs were broken as well! The good thing was that all the Diablo GT's have two valve springs per valve and the two are different. As a consequence no valve had two broken valve springs at the same time. Otherwise the engine would have blown off for sure. The inner valve springs weren't broken but as they are much weaker than the outer springs the valve might get burned after a while. In addition the engine doesn't have the full power. The engine of that car already had quite some mileage on the clock: 60'000 Km or about 40'000 miles.

 

As I have seen the broken springs with my own eyes you can imagine that I was a bit worried about my car as well. As I wrote above if both valve springs are broken your engine will be gone. My car has considerably less mileage, a bit more than 15'000 but the risk was too big for me. In addition it was a good time to replace the cylinder head gasket as well on my car as some oil was leaking and a major service was due too. Obviously I was quite curious about the outcome: My car had five broken valve springs as well! As a consequence we replaced all of them, in total 96 (48 inner and 48 outer springs). The material isn't expensive less than USD 400 but it takes quite some work.

 

As most of the Lambopower Members are from the USA and hardly any GT is in your country you think that you might not be affected. However I highly doubt that the engine of the Diablo VT 6.0 has different valve springs than the ones in the engine from the GT. In addition the Murcielagos might have the same springs as well. According to my Lambo dealership only the valve springs of the LP640 are different. Murci owners might double-check if they have the same springs.

 

I don't want to make Diablo GT, VT 6.0 or Murci owners to panic but I think that there is quite a big risk that their cars have the same issues and worst case their engine will blow up if both valve springs are broken. In case you have a major service planned or if the engine needs to be taken out of the car for replacing the clutch or the head gasket it's definitely worthwhile to check all the valve springs and replace them.

 

I hope that this information helps to prevent any major engine problems on your cars.

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Here are the two part numbers for inner/outer springs:

001223097

001220988

 

Fitment says: Lamborghini Countach 25th Ann. (1989), Countach 5000 QV (1985), Diablo (1991), Diablo 6.0 (2001), Diablo GT (1999), Diablo Roadster (1998), Diablo SE30 (1995), Diablo SV (1997), Diablo SV (1998), Diablo SV (1999), Diablo VT (1994), Murcielago (2003)

 

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Here are the two part numbers for inner/outer springs:

001223097

001220988

 

Fitment says: Lamborghini Countach 25th Ann. (1989), Countach 5000 QV (1985), Diablo (1991), Diablo 6.0 (2001), Diablo GT (1999), Diablo Roadster (1998), Diablo SE30 (1995), Diablo SV (1997), Diablo SV (1998), Diablo SV (1999), Diablo VT (1994), Murcielago (2003)

 

 

Hi, tks for the useful information. In that case more cars than expected might be affected. However it might also be possible that just during one or two years the manufacturer produced a defective batch.

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Excellent info. to know. Thank you both for sharing.

 

Would the LM002's be captured too since the earlier ones share engines with the Countach and the later one with the Diablo?

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Excellent info. to know. Thank you both for sharing.

 

Would the LM002's be captured too since the earlier ones share engines with the Countach and the later one with the Diablo?

 

I my opinion the engine of the LM002 is not exactly the same as in the Countach QV or Anniversary. I think they have different camshafts. The engine of the LM002 feels to have more torque at lower revs. In addition the red area of the rev counter starts earlier in the LM002 and I wouldn't dare at all to rev it up to 7500 rpm which is possible in the Countach. If my assumption is correct the valve springs are probably different ones due to the different camshafts.

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  • 1 month later...
I my opinion the engine of the LM002 is not exactly the same as in the Countach QV or Anniversary. I think they have different camshafts. The engine of the LM002 feels to have more torque at lower revs. In addition the red area of the rev counter starts earlier in the LM002 and I wouldn't dare at all to rev it up to 7500 rpm which is possible in the Countach. If my assumption is correct the valve springs are probably different ones due to the different camshafts.
Injected LM002 had different cams for sure!

I'm not sure on the carb'ed LM002 as HP rating is the same. It might be just ignition timing difference.

 

I think the springs failed due to some sort over-stress... I've never heard about other cars having the same issues, but head gaskets are weak.

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