89 bmw 525i timing belt replacment, timing marks are on, got spark got fuel, have no compression, could it have been possible to damage the head/valves of all six cyl's to have no compression? what else could have happened? the car was at idle when the timing belt went??? i know quite a bit about cars, but having a hard time believing this issue. will be pulling the valve cover to confirm valves next...

STOP what you are doing before you damage something!! Whatever you are trying to remove is not the water pump. Neither the sparkplugs nor the "timing belt" cover needs to come off. Remove the fan belt. Remove the fan (the nut is LH thread- means it turns left to tighten and right to loosen). You will need a large wrench (32mm) availible at sears.The water pump is directly behind the fan and is held in by 4 10mm bolts.

On 1989 BMW 525i (E34) 2.5 liter SOHC L6 (M20)...




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Jose.

It is possible to set the timing wrong....if the belt broke well running I believe this is an interference motor..meaning if the timing is off the cylinder can move up and smack a Valve being exhaust or intake. which means a valve can break or bend cause lack of seal thus no compression. When setting the timing you want to align your marks with Cylinder # 1 it needs to be on the compression stroke..you can do this by removing cyl 1 spark plug and rotating the crankshaft with your finger over the spark plug hole you will feel air press against your finger meaning all valves are closed and your in compression stroke. Then line up your marks and you should have it...I would consider purchasing a compression tester to make sure no damage to the cylinder head....good luck hope this helps

yes its possible to have snapped belt but the sensor is on the crank so it will spark ,just take the cover off the front of the timing belt and see if its turning ,if you dont know how to do any of this then please ask a local mechanic to have a look for you before you damage something

check for a spark if no spark and engine cranks ok then renew the ignition module

I have a funny feeling that you have the belt on wrong. I know, you said the marks line up, but a compression check is easy and just confirms everything. Failing that, could you have the plug wires on wrong...I'm wondering if spark is occurring on the compression stroke or the exhaust stroke, and all this could come back to if the cambelt is on right as well.

Bottom line; if you have spark, fuel and COMPRESSION, it'll run.

I don't think a 1995 3 series has a timing belt. 100% sure if its the inline 6 cylinder.bmw only used timing belts on two engines. (never replaced one) I would first start with a fuel pressure check to start your diagnosis. From there i'd check to see if you are getting spark and maybe even see if your plugs are fouled. If you have fuel pressure and spark, i'd suspect bad gas.(especially if the problem occured soon after filling up). It may be a good idea to do a compression check if you found no fault with the vehicle.

Hi, your fuel pump is located in the trunk underneath an access cover on the passenger side. remove the screws on the cover and you will see the in tank pump and sending unit. when replacing your pump, make sure to note the position of the 2 fuel hoses so you don't accidentally cross them when putting in the new pump.

Your timing belt jumped. Need to have belt replace and timing reset with timing jumped hope no engine damage

An image of a serpentine belt, hope this will help you,
Eitan.