T4 #4 piston

[grvwsic]

Is there a trick on removing the #4 piston on a 1.7 Type 4?

I can't seem to get the right angle to push the pin out. Now it's stuck.

My first T4 to rebuild. It's been sitting waiting for me to do something.

Any advice is appreciated. Thanks

[APPLEGREENVW]

Look up youtube.
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[oprn]

Just unbolt the rod and take it off on the bench.

[busdaddy]

Heat the piston up with a propane torch, the pin will be much more co operative
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[grvwsic]

Thanks all! Just not thinking clearly. My brain turned into noodles.

I will follow your suggestions.

Thanks again.

[oprn]

My current machinist claims VW piston pins are way too tight. Says they should be a thumb press fit at room temp in the pistons. He could be right as in all the years I have been playing with these engines I have never seen them loose enough to slide out on thier own. You always have to hammer them out even on high mileage engines. The small end of the rods is another story though. This tells me that with the pins so tight in the pistons the pins are not rotating properly in the pistons.

It could also be an indication that these engines are not running at thier design temperature what with every man and his dog throwing away the thermostats.

[GARRICK.CLARK]

Take rod off.
Then if your saving the piston. Put rod in a fixture. Heat up both sides of piston were the clips fit and lightly tap the gudgeon pin. Try tapping the pin from both sides, often the pin moves easier from left to right OR right to left.

[orwell84]

Pins never seem to just push out for me when I am taking apart a used engine. They always seem to require a light tapping. When everything is all clean again they seem to fit correctly again.

[busdaddy]

Used engines build up a narrow ring of scum on the pin each side of the rod, that's usually what makes it bind coming out. Carb cleaner helps, but heating the piston always solves the problem.
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[oprn]

Pin bosses on the piston never seem to show any wear but the small ends of the rods sure do! When you get new rods they are always a thumb press fit but new pistons have to be tapped in or heated.

According to him that is wrong. I can tell you it was a treat to assemble the engine after he fitted the pins properly! He goes for a 1/4 to 1/2 thou clearance, tells me they come as an interference fit out of the box.

[modok]

in order to get the pins out you usually have to cut the burr off the edge of the c-clip groove, then heat up the piston. The pin should then slide right out.

True of most pistons like this, in many kinds of engine.


tho if the pistons are not good enough to re-use, then.....i would not bother with that, just get it apart quick and dirty whichever way you want short of bending the rods in the process, unless the rods are junk too..... ok just get a hammer

[grvwsic]

The pin was sprayed with Liquid Wrench and left overnight.

I couldn't remove the rod but was able to move it a bit 1/4 "

Worked on it this morning and got an angle. It tapped out with a little persuasion.
Finally!.

Thanks all and stay safe.

[GARRICK.CLARK]

It's had a heavy blow by problem that engine. Are you going to get a 1911 piston kit for it

[grvwsic]

Was planning to get the heads redone, get the seats replaced also buy a 96mm big bore. But I'll see what I could do so that it will be ready for the spring season

[GARRICK.CLARK]

Have you looked at the cam lobe's yet. Try get a close up shot of the lobe's through the cylinder spigots. Ta

[grvwsic]

I m planning to split the case sometime next week,
but here are shots of two of the cam lobes. not too clear

intake 2/4

exhaust 1/3

[GARRICK.CLARK]

Yeah it's got a groove in the middle hasn't it.
European Motor works have some good type 4 parts.

[grvwsic]

Thanks for the heads up. Now I know what to look for when I go shopping for parts. And won't be a surprise.

[GARRICK.CLARK]

Always fit new exhaust valves.
When it's back running Wright down the milage for ref purposes.
Exhaust valve's don't last as long as a type 4 bottom end can.
Johnston lifters are compatible with scat type 4 cams.

[raygreenwood]