Perkins
Re: Perkins
Would just using 2 gaskets do it?
Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.
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tractorman
- Posts: 1399
- Joined: Mon Feb 21, 2011 11:22 am
- Location: Wigton, Cumbria
Re: Perkins
I suspect you'll need a little more than five thou removed - allow for a little slap in the piston as the bearings wear! I doubt double gaskets would be a great idea - it may be OK with petrol/paraffin Fergies, but the compression ratio is slightly higher on a 135!
It's just a shame that, whoever did the last repair didn't put new liners in - or did they? Are the old pistons completely shot, or is it worth cleaning them up and seeing if they can be reused?
I hope the liners are good and tight, with no chance of hot spots welding them to the block! I know the A3 was different, but I did have one drop a liner when I was driving it - it makes an interesting knocking noise (a late 35X, the boss had a spare tractor in a shed - a grey/gold Ferguson 35 that had to be tow started most of the time! It wasn't too bad until a back tyre punctured and he had to put a smaller (grey Fergy) wheel and tyre on - from another of the tractors hidden in the shed!
It's just a shame that, whoever did the last repair didn't put new liners in - or did they? Are the old pistons completely shot, or is it worth cleaning them up and seeing if they can be reused?
I hope the liners are good and tight, with no chance of hot spots welding them to the block! I know the A3 was different, but I did have one drop a liner when I was driving it - it makes an interesting knocking noise (a late 35X, the boss had a spare tractor in a shed - a grey/gold Ferguson 35 that had to be tow started most of the time! It wasn't too bad until a back tyre punctured and he had to put a smaller (grey Fergy) wheel and tyre on - from another of the tractors hidden in the shed!
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Young Farmer
- Posts: 151
- Joined: Wed Jan 26, 2011 8:27 pm
Re: Perkins
When you say that the pistons are 5 thou too high do you mean the liners or the pistons are too high? I seem to remember that the liners are supposed to protrude by about 5thou. On Ford and Nuffield engines liners sinking in the block was an issue and they had to be shimmed to get the correct protrusion otherwise the head gasket wouldn't last 5 minutes. These engines had wet liners ,not dry ones as in Perkins engines. I have given my Perkins manuals to the local vintage tractor club so I haven't any specifications to help you. Try ringing Perkins technical support as I have found them extremely helpful in the past.
Re: Perkins
AD3 liners are flush to 0.004 below block face. The 4cylinder is flush to 0.004 above.
I have clocked the pistons they are 0.005 above the face but the new gasket is 0.040 and even the old gasket i took off is still 0.035.
I have clocked the pistons they are 0.005 above the face but the new gasket is 0.040 and even the old gasket i took off is still 0.035.
Re: Perkins
So as long as the HG's fire rings are outside the edge of the liners on all three then, you'll get away with this nicely. Result! 
J
"Home is where you park it", so the saying goes. That may yet come true..
"Home is where you park it", so the saying goes. That may yet come true..
Re: Perkins
Just been told on a 'tractor' forum that 0.004 is top limit. 
according to that it should be fine i'm not arguing over a thou.
according to that it should be fine i'm not arguing over a thou.