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Car Forum / BMW Cars / August 2006Reboring /sleeving 740 4.4 engine
I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 740 4.4 litre the technician accidently dropped the screw top of the spark plug into one bore. Needless to say on start up destroyed the head and scored the cylinder. The dealership now wants to machine the bore and put in a metal liner. Is this possible on a aluminium alusil engine? I would have thought the correct thing to do would be to replace the block or the entire engine! Any advice would be appreciated Cords > I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 > 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 7 lines] > Any advice would be appreciated > Cords I would have thought that the replacement option would be easier and just as cost effective. I would guess that the piston and maybe the con-rod is damaged too. > > I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 > > 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 11 lines] > just as cost effective. I would guess that the piston and maybe the > con-rod is damaged too. Thanks...will follow up on the rod and piston! >> I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 >> 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 11 lines] > just as cost effective. I would guess that the piston and maybe the > con-rod is damaged too. Not sure about the Alusil 4.4, but the Nikasil 4.0 can not be rebored / sleeved because there is insufficient clearance to the oil / waterways in the block. > I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 > 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 4 lines] > I would have thought the correct thing to do would be to replace the > block or the entire engine! You have a right to demand the car be returned to the same condition as you brought it in, plus the work you paid them to perform. Iron sleeving one of 8 alusil bores is NOT making you whole. You need a new or factory reman engine, or a salvage engine of equal or lower miles, and a guarantee with whatever they install. Do not let them sleeve your motor. While the piston is likely peened a little, the rod is probably OK. But the combustion chamber in the head is also suspect. A lot depends on the miles on your engine as to what might be a fair replacement, but I'd assume the factory engine is good for 200K miles. If you have had that car for 9 model years it is a reasonable assumption that you intend to keep it for several more years. It sounds to me like they are trying to not file an insurance claim. They carry insurance for just this sort of thing, but of course their claim history affects their rates and future insurability. > > I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 > > 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 20 lines] > claim. They carry insurance for just this sort of thing, but of course > their claim history affects their rates and future insurability. Thanks...my thoughts exactly!...They talk about replacing the head with a second hand one which they will check. The Car has only done 62 000 miles and all long distance so the engine was like new...very Disappointing to say the least I agree, that sleeving is a cheap way out and they know it. I would demand that they replace the engine with a new engine, especially since the old engine was taken care of from the sounds of it. If not im sure your lawyer can make them see the light ;) -Branden >> > I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 >> > 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 25 lines] > miles and all long distance so the engine was like new...very > Disappointing to say the least > I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 > 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 7 lines] > Any advice would be appreciated > Cords No. You can't resleeve an engine that does not have sleeves. The Alusil or Nikasil engines are alloy blocks with a very thin coating in the bores. Not sleeves. They will find this was a very expensive mistake. New short block, new head. Big bucks.  Signature-Fred W >> I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 >> 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 14 lines] > They will find this was a very expensive mistake. New short block, new > head. Big bucks. These engines are made from an aluminum alloy that has copious quantities of a very hard material (forget which one). Anyway, a very thin layer of hard material forms the wear surface. Go through that, and you are left with aluminum which is a very very very poor choice for wear. Jim >These engines are made from an aluminum alloy that has copious quantities of >a very hard material (forget which one). Anyway, a very thin layer of hard >material forms the wear surface. Go through that, and you are left with >aluminum which is a very very very poor choice for wear. Silicon. It's the "sil" in nika/aluma-sil. SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net >>These engines are made from an aluminum alloy that has copious quantities >>of [quoted text clipped - 4 lines] > > Silicon. It's the "sil" in nika/aluma-sil. During the manufacturing, all but the silica gets removed from the cylinder bore. Jim >> I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 >> 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 9 lines] > > No. You can't resleeve an engine that does not have sleeves. Sure you can. It was routine back when Vegas roamed the earth. Still is a big business when you need to reclaim an otherwise good block that might not be replaceable. It is a common, weekly operation at any automotive machine shop. But even then they didn't sleeve just the one bad cylinder. >>> I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 >>> 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 16 lines] > > But even then they didn't sleeve just the one bad cylinder. See previous, AFAIAA the walls are too thin to bore out and sleeve. >>> I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997 >>> 740 4.4 litre the technician accidently dropped the screw top of the [quoted text clipped - 16 lines] > > But even then they didn't sleeve just the one bad cylinder. Yes, you are technically correct. It can be done. I should have said, "you *shouldn't*...". The ngine was not designed for sleeves and would not run the same. Besides, why settle for some bodged-up repair when the shop was obviously fully liable for the incident? Signature-Fred W > No. You can't resleeve an engine that does not have sleeves. No - but you can *sleeve* some. Used to be common if the wear or damage exceeded the maximum re-bore size. Gave you a better bore material, too. > The Alusil or Nikasil engines are alloy blocks with a very thin > coating in the bores. Not sleeves. Dunno if it's possible to sleeve the V-8. Some of the alluminium sixes had liners after the Nikasil thingie. > They will find this was a very expensive mistake. New short block, new > head. Big bucks. I hope not built up by the same firm that drops bits inside the engine without noticing...;-) Personally, I'd go for a similar mileage engine from a wreck. Signature*Suicidal twin kills sister by mistake. Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound. > > No. You can't resleeve an engine that does not have sleeves. > [quoted text clipped - 20 lines] > Dave Plowman dave@davenoise.co.uk London SW > To e-mail, change noise into sound. Thanks for all the advice.....looks like I might have a small fight on my hands! I wander what BMW Germany official stance would be on re sleeving a Alusil block? Thanks again to all! > I wander what BMW Germany official stance would be on re sleeving a > Alusil block? Somewhere I'd heard there were problems using a boring machine with alusil - heavy wear on the cutter. Signature*Therapy is expensive, poppin' bubble wrap is cheap! You choose. Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound.
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