In article <1110278185.261583.195020@f14g2000cwb.googlegroups.com>, tf19@hotmail.com wrote:>
When I start the engine of my 96 Metro in the morning, it sounds like a>tractor, lots of knocking coming from the engine.>
But after a few minutes, its fine, and you don't hear anything. Someone>said>it might be the fuel pump gone.>
This only happens if its been left all night, not when its only been>left>for a few hours.
Could be self-adjusting tappets - thingys that come between valves and camshaft. See http://www.volvoclub.org.uk/tech/HydraulicTappets.pdf They expand under oil pressure provided by the oil pump so that no valve adjustment is necessary.
Overnight the pressure drops and a gap appears as if the valves weren't adjusted. At lower temperatures, when the oil is thick, it takes some time to recharge them. If the sound is present more frequently at low temperatures then this is probably the cause. Different grades of oil will also affect recharge rate.
The service manual for my BMW with a M50 2.5l engine states that this is not considered a problem unless the noise doesn't disappear after 15 minutes.
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Don Stauffer in Minneapolis 8 March 2005 18:57:38 [ permanent link ]
tf19@hotmail.com wrote:
When I start the engine of my 96 Metro in the morning, it sounds like a> tractor, lots of knocking coming from the engine.>
But after a few minutes, its fine, and you don't hear anything. Someone> said> it might be the fuel pump gone.>
This only happens if its been left all night, not when its only been> left> for a few hours.>
Any suggestions?>
Thanks>
Could be several things, but probably not fuel pump. Lifters is one thing. When car is left for long time, oil drains out of hydraulic lifters. When cold engine is started, lifters do not fill entirely at first, takes a bit of time.
Piston slap. Piston clearances are larger on cold engine- as engine warms up pistons expand more than cylinder bore does. My car (Neon) had this at about forty thousand. Dealer said- fairly normal, it won't get worse. Indeed it hasn't. Still slight knock but I have over eighty five thousand on it and noise is no worse now.
<tf19@hotmail.com> wrote in message news:1110278185.261583.195020@f14g2000cwb.googlegroups.com...>
When I start the engine of my 96 Metro in the morning, it sounds like a> tractor, lots of knocking coming from the engine.>
But after a few minutes, its fine, and you don't hear anything. Someone> said> it might be the fuel pump gone.>
This only happens if its been left all night, not when its only been> left> for a few hours.>
I am surprised that a Metro has lasted this long. Most of them seem to have been scrapped. A nastier example of a rusty Leyland [BL] model would be hard to find barring the Morris Ital.
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