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Oct 18, 2010 7:32 am
Oct 18, 2010 7:32 am
Subject: DB3l engine back in !
This was a long story, the workshop doing the engine took 2.5 years. Finally I have the engine back and here are some photos and a short description:
The engine received: laser welding of block, repair of aluminium cast front end plate with water pump channel, repair of suction manifolds, new: liners, pistons, crankshaft, valves and seats, oil pump..
Lets start with the block: it had the usual crack between adjacent cylinders but rather enlarged by corrosion. This part was cut out and a new little piece fit in. The block was heated under vacuum several times to get old oil and glycerine out of the pores before laser welding. The idea for laser welding was that it avoids the heat of classical welding, in which case the whole block would have to be heated very much before, with risk of distortion. They did not do it in their workshop but at some aerospace industry company. I hope that I will not dismantle it ever again but if so, I would report about if it lasted. We also were hesitating if it was really necessary (the liners seal, the block is only a support) but now having it done I feel better.
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This was a long story, the workshop doing the engine took 2.5 years. Finally I have the engine back and here are some photos and a short description:
The engine received: laser welding of block, repair of aluminium cast front end plate with water pump channel, repair of suction manifolds, new: liners, pistons, crankshaft, valves and seats, oil pump..
Lets start with the block: it had the usual crack between adjacent cylinders but rather enlarged by corrosion. This part was cut out and a new little piece fit in. The block was heated under vacuum several times to get old oil and glycerine out of the pores before laser welding. The idea for laser welding was that it avoids the heat of classical welding, in which case the whole block would have to be heated very much before, with risk of distortion. They did not do it in their workshop but at some aerospace industry company. I hope that I will not dismantle it ever again but if so, I would report about if it lasted. We also were hesitating if it was really necessary (the liners seal, the block is only a support) but now having it done I feel better.
Attachments: