Stu66
Member
G'Day All,
A Cam Bearing or 2 and maybe a lifter or 2 have gone in our 2004 Zafira, so I have a big question followed by the rundown.
The Big Question:
Is it feasible to lock the Cam sprockets (with KM6148 tool), leave the tension on the chain, remove the cams, replace whatever cam-bearings, cams, tappets or lifters need it, and put the cams back on, without having to move the sprockets/chain and remove the Timing Chain Cover, assuming that the chain and sprockets are currently in the correct timing locations (and of course assuming at this point that there isn't something even more drastic wrong with the head etc) ?
Here's the rundown:
Said car was running OK, timing normal, no oil-pressure light or temperature problems, until the start of a simultaneous screaching sound (reads metal-on-metal) and a constant loud rattle (reads tappets/lifters not chain) that got progressively worse so the car's now in my garage with the Cam Cover off, and pot #4 @ TDC (see photo #1 showing cam lobes up and in) and the Crank Timing marks are lined up (see photo #2 showing pulley & timing case marks and photo #3 showing secondary marks I put at bottom to make it easier to see when turning Crank with a socket drive from under the car).
Removal of the Cam cover revealed shavings of metal (including a 1 x 1.5cm concaved piece) from a bearing and metallic sludge (probably bearing ground-down with oil) sitting around the top of the head. Bearing-Cap on #4 EXH cam was loose, which I relate to the bearing now gone thus slack (see photo 4 showing the bearing missing).
The chain is still tight, and photo 5 shows INT and EXH timing marks appear in the correct alignment, but there is only a purple chain link (I can't see the chain at the location of the crankshaft sprocket but I'm happy its #4 at TDC with marks lined up).
I haven't removed the Timing Chain Tensioner or Cover yet as I'm hoping I can keep the chain and sprockets still and tensioned to keep the chain from dropping off the bottom of the crankshaft sprocket, while the cams are off.
I'd really appreciate some advice on the feasibility of just buying the Valve Timing Tool and going from there; as once back on the road the car will be sold to get a bigger 7 seater anyway, so am after the quickest, easiest and cheapest option.
Thanks for the great support and dedication you all provide to people right across the globe.
Cheers Stuart
A Cam Bearing or 2 and maybe a lifter or 2 have gone in our 2004 Zafira, so I have a big question followed by the rundown.
The Big Question:
Is it feasible to lock the Cam sprockets (with KM6148 tool), leave the tension on the chain, remove the cams, replace whatever cam-bearings, cams, tappets or lifters need it, and put the cams back on, without having to move the sprockets/chain and remove the Timing Chain Cover, assuming that the chain and sprockets are currently in the correct timing locations (and of course assuming at this point that there isn't something even more drastic wrong with the head etc) ?
Here's the rundown:
Said car was running OK, timing normal, no oil-pressure light or temperature problems, until the start of a simultaneous screaching sound (reads metal-on-metal) and a constant loud rattle (reads tappets/lifters not chain) that got progressively worse so the car's now in my garage with the Cam Cover off, and pot #4 @ TDC (see photo #1 showing cam lobes up and in) and the Crank Timing marks are lined up (see photo #2 showing pulley & timing case marks and photo #3 showing secondary marks I put at bottom to make it easier to see when turning Crank with a socket drive from under the car).
Removal of the Cam cover revealed shavings of metal (including a 1 x 1.5cm concaved piece) from a bearing and metallic sludge (probably bearing ground-down with oil) sitting around the top of the head. Bearing-Cap on #4 EXH cam was loose, which I relate to the bearing now gone thus slack (see photo 4 showing the bearing missing).
The chain is still tight, and photo 5 shows INT and EXH timing marks appear in the correct alignment, but there is only a purple chain link (I can't see the chain at the location of the crankshaft sprocket but I'm happy its #4 at TDC with marks lined up).
I haven't removed the Timing Chain Tensioner or Cover yet as I'm hoping I can keep the chain and sprockets still and tensioned to keep the chain from dropping off the bottom of the crankshaft sprocket, while the cams are off.
I'd really appreciate some advice on the feasibility of just buying the Valve Timing Tool and going from there; as once back on the road the car will be sold to get a bigger 7 seater anyway, so am after the quickest, easiest and cheapest option.
Thanks for the great support and dedication you all provide to people right across the globe.
Cheers Stuart