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#1
05-03-2020, 11:12 AM
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So assuming I have all the tools I need, which I do have and experience tearing down motors completely and putting them back together except not an M54, what would the reason be to expect a dead motor rather than just a head gasket?
Any used M54 would probably need at least new oil rings from what I've surmised.
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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed, 
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#2
05-03-2020, 12:05 PM
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Quote:
In most cases, this debate between swapping in a used engine vs doing a head gasket involves an overheated engine -apparently not the case here. In most cases, a head gasket is more work, more time and about the same money (after machine costs and any tool rental) than buying a used M54 and slapping it in. I would also suggest a head gasket has a greater chance of failure (mine just failed 5k miles after doing a head gasket 6 months ago), though the chance of failure is low if done properly. As mentioned above, doing a head gasket in your particular situation is what I would suggest. I would certainly get the head and valves checked and decked.
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#3
05-03-2020, 11:24 AM
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The fact that you have compression in both cylinders, and the fact that the engine misses only at idle but runs fine at high rpm I would just drive it and till it dies. It's a 19 year old SUV and the price has come down to the point that fixing the BMW will cost just as much as buying another BMW X5.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#4
05-03-2020, 11:32 AM
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Can't argue with that. Solid logic. I've swapped heads on a couple M62 motors. Can't leave the header attached on the V8, that's a solid perk on the 6! If the rest of the engine is solid and the car is worth saving I would definitely do the head gasket. Probably including the timesert as described above. I would also do vanos refresh at the time. Anti rattle upgrade and if it's the same as M62, the o-ring upgrade.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#5
05-04-2020, 07:54 PM
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[QUOTE=andrewwynn;Anti rattle upgrade and if it's the same as M62, the o-ring upgrade.[/QUOTE]
Can you elaborate or pontificate on the anti-rattle and o-ring upgrades?
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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,
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#6
05-03-2020, 02:54 PM
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I would do a leak down test for more information and then pull the head to take a look.
I try hard never to give up on the engine I have. Often the devil you know is better than the devil you don't know.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#7
05-04-2020, 08:06 PM
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The vanos internal orings wear and cause them to work poorly. It's not too difficult to replace the o-rings to bring them back to like new performance.
On the M54, I've read of vanos rattle and a kit with a thicker spacer to eliminate the rattle. If the vanos tracks requested angle properly I prob would not do the refresh but I would look into both of those If I had the valve cover off for any other repair. Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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