Piston Problem.
Piston Problem.
So apparently, the pistons are jammed which is preventing the timing gears from moving and my car from starting, We bought a set of pistons and piston rings. MY question is, does anyone know of a Guide or some sort of directions for reinstalling/uninstalling pistons?
Re: Piston Problem. (Xoltol)
Well sir,
If your pistons are "jammed" as you say, you have a bigger problem. But here you go.
-Remove heads-Remove oil pan-Remove oil pump pickup-Remove rod caps...mark them with a punch to keep track of them.-Tap rods to force pistons out
Done... pistons out.
The wristpins are pressed so you will have to use a hydraulic press to get them out.
You will need to bore or hone the cylinder wall depending on the condition. I would also polish my crank with emery cloth, purchase new main/rod bearings, and maybe even have a machine shop do it for you. Mesing around with plastigauge and assembling bottom ends is quite a task.
It is always a good learning experience though.
Hope I helped....
If your pistons are "jammed" as you say, you have a bigger problem. But here you go.
-Remove heads-Remove oil pan-Remove oil pump pickup-Remove rod caps...mark them with a punch to keep track of them.-Tap rods to force pistons out
Done... pistons out.
The wristpins are pressed so you will have to use a hydraulic press to get them out.
You will need to bore or hone the cylinder wall depending on the condition. I would also polish my crank with emery cloth, purchase new main/rod bearings, and maybe even have a machine shop do it for you. Mesing around with plastigauge and assembling bottom ends is quite a task.
It is always a good learning experience though.
Hope I helped....
-
mtcookson
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Actually... the 84 to ~4/87 VG30's have pressed in wrist pins. The later "W-series" VG's have floating wrist pins held in with clips.
Check out http://www.nicoclub.com/FSM for the factory service manual for your vehicle. That will give you the absolute best rebuilding info.
Lastly, if the pistons are jammed on something, in a VG, it is likely that the timing belt broke and a piston hit a valve which means you'll also need to rebuild or just get replacement heads.
I'd shop around some local salvage yards or take a look at http://www.car-part.com for a replacement engine. In a lot of cases you can get a whole VG cheaper than it would cost to rebuild it. You can use pretty much any VG from other car models as a replacement by simply swapping all of the external pieces from your current engine to the replacement. This makes finding a replacement much easier. I'd just avoid the VG30's offered in the Nissan, Ford, and Mercury vans as they're designed differently and don't make quite as much power due to that.
Check out http://www.nicoclub.com/FSM for the factory service manual for your vehicle. That will give you the absolute best rebuilding info.
Lastly, if the pistons are jammed on something, in a VG, it is likely that the timing belt broke and a piston hit a valve which means you'll also need to rebuild or just get replacement heads.
I'd shop around some local salvage yards or take a look at http://www.car-part.com for a replacement engine. In a lot of cases you can get a whole VG cheaper than it would cost to rebuild it. You can use pretty much any VG from other car models as a replacement by simply swapping all of the external pieces from your current engine to the replacement. This makes finding a replacement much easier. I'd just avoid the VG30's offered in the Nissan, Ford, and Mercury vans as they're designed differently and don't make quite as much power due to that.