Exhaust Manifold
Hi everyone, I have a 1999 5-door 1.8 litre Pajero iO with automatic transmission. I am attempting to get the exhaust manifold off, but haven't managed it yet.
I have removed all of the nuts that hold the flange onto the engine head.
I have removed 3 nuts from the joint between the manifold and the exhaust pipe.
So far I haven't broken anything, but I have left a bit of blood and flesh behind in the process.
There is a mounting bracket between the exhaust manifold and the engine block. I can just manage to touch the nuts and bolts associated with this bracket, but it seems to me to be almost impossible to get a spanner on to them, and if I could I doubt that I could turn it.
I have had my iO for 17 years, and I have enjoyed owning it. However, while trying to get the exhast manifold off, I have started to fall out of love with it. I don't normally swear, but the difficulties that I have had have made me say "Bum!" several times.
I hope that someone (who really has done this job themselves) will be able to advise me how to procede.
Thanks, Skinned Knuckles (Knuckles, for short)
That annoying little water hose
Dear iO friends, my main reason for pulling my car to bits is to replace that annoying little water hose that is located behind the engine block.
If I am posting this in the wrong place, perhaps someone in Admin can fix it.
Anyway, that hose really does exist, even though you can't see it, and you can hardly even touch it with a fingertip.
I eventually got the exhaust manifold off. A socket spanner universal joint and several extension bars are necessary to undo a couple of nuts / bolts.
I loosened the O2 sensor with my big shifting spanner, however this was unnecessary. After undoing the 3 nuts that connect the manifold to the front exhaust pipe, I found that you can just push the exhaust pipe down and it flexes at the flexible joint.
I have replaced the rubber hose, and I am just about to put the exhaust manifold back on.
I replaced the rocker cover gasket. The old one had gone rock-hard, and was leaking oil down the back of the motor. This appears to have caused the annoying little water hose to deteriorate.
While the rocker cover gasket was off, I looked at the valve clearance adjustment. The car has done 320000 klms, and I believe that the valves have never been adjusted. Early in it's life, I asked the dealer about the valve adjustment, and I was told that it was automatic and didn't need attention. That isn't true for my car, I now find out. Some of the exhaust valves needed adjustment, and some didn't. The inlet valves are almost impossible to do. Getting the feeler gauge in is very difficult, and I believe that you would need a strip of 0.09 mm feeler gauge, with a right-angle bend in the end. I satisfied myself by just rocking the rockers, and feeling the clearance. Zero point zero nine mm is very little clearance. I found that all of my rockers did have some clearance, but it wasn't much. This gap gets bigger when the engine warms up. The workshop manual gives the "cold" clearance, and my Owners Manual gives the "hot" clearance.
Knuckles
Syndicate
Hello again, Knuckles here,
Hello again, Knuckles here, replying to my own post.
I should have realized that I need to drop the exhaust pipe down, and this will give me access to the bolt that secures the bracket to the side of the engine block.
It may seem pretty obvious that I had to remove the exhaust pipe (and this is the way I always did it on other cars, over many years). However I was trying to reduce the amount of things that I had to remove (and replace).
There is still one bolt that I need to remove to allow the exhaust pipe to drop down. I will need to try using a universal joint with my socket extension, because I can't get a straight approach to the bolt from underneath. I have already had to use the universal joint when undoing some of the 3 nuts that secure the exhaust pipe to the exhaust manifold outlet.
If I am sucessful in removing that final bolt, my next problem will be the O2 sensor. I don't want to remove it, so I have looked at unpluging it's cable at the other end. This also looks difficult.
Knuckles