how does my cylinderhead look?

juhiss · Dec 27, 2010

Will those few scratches between valves have any effect on the performance? I just want to be sure before i assemble the engine :?
How does the cylinderhead otherwise look in your view

here you go:

Regards

juhis

Finland

squizz · Dec 27, 2010

That is one very sexy looking head!!

How many other Fins have a head that sexy :twisted:

All I would do is give the valves a quick lap in the seats and slap it back on.

steve · Dec 27, 2010

I'm no expert, but I've reused heads with more damage than that. It'll carbon up and likely be fine. Like squizz says, just lap the valves and good to go.

Steve

juhiss · Dec 27, 2010

steve said:
I'm no expert, but I've reused heads with more damage than that. It'll carbon up and likely be fine. Like squizz says, just lap the valves and good to go.

Steve

What kind of stuff do you prefer for "lapping"? something that i can get from ebay

any suggestions?

And more questions:

Does it make any diffrence which way i install the "exhaust" valves?(i'm aware that they have to go to the same locations i took them from,(repair manual)). The valve edge is wider than the opposite edge.Its not symmetrical. Hard to explain, here is a poor photo. Intake valves seems to be indentical.
Someone said that i should allso wirewheel my valve contact surface's before lapping them, makes sense. They look pretty clean though, ecxept the exhaust valves.

ned37 · Dec 27, 2010

What kind of stuff do you prefer for "lapping"?

coarse and fine valve grinding compound. should be available at any auto parts store.
you apply it to the seat area and spin the valve back and forth to lap the edges and the seat. first coarse then fine. i used to have a suction cup stick device and spin it down from the big end. lost that a long time ago and now i connect a piece of tubing to the stem and spin it while pulling up.

juhiss · Dec 27, 2010

ned37 said:
What kind of stuff do you prefer for "lapping"?

Click to expand...

coarse and fine valve grinding compound. should be available at any auto parts store.
you apply it to the seat area and spin the valve back and forth to lap the edges and the seat. first coarse then fine. i used to have a suction cup stick device and spin it down from the big end. lost that a long time ago and now i connect a piece of tubing to the stem and spin it while pulling up.

Thank you ned!

berger · Dec 27, 2010

ned37 said:
What kind of stuff do you prefer for "lapping"?

Click to expand...

coarse and fine valve grinding compound. should be available at any auto parts store.
you apply it to the seat area and spin the valve back and forth to lap the edges and the seat. first coarse then fine. i used to have a suction cup stick device and spin it down from the big end. lost that a long time ago and now i connect a piece of tubing to the stem and spin it while pulling up.

I just chuck the valve stem up in a cordless drill.

mark2e0 · Dec 28, 2010

You really need a stick with a suction cup on one end, Or you used to be able to get something which went into a drill with a suction cup on the end.
You should when reseating the valves do a backward and forward motion with the cup, bit hard to explain but if you was to look down on the valve and picture 12, O'clock and 3 O'clock just move the suction cup from 12 to 3 and back from 3 to 12 , after you have done that for a while and got totally bored, move the valve around a bit, as you look down on the valve picture 12 O'clock move the valve around to about 4 O'clock and start over again until you work your way around to 12 O'clock

Bluto · Dec 28, 2010

My advice:
Don't use the drill,just use the good old wooden stick with the suctioncup and your hands.
Just rotate back and forth,first using the coarse and the the fine lapping compound.Use a little spit to "lubricate"the compound.
Make sure the seats are evenly grey(no shiney spots) and are not getting too wide.

plumbbob · Dec 28, 2010

The valves themselves rotate as the engine runs so as long as it goes in the port where it came from you cant go wrong.

Carl

Taffy · Dec 29, 2010

Bluto

Berger is on about the CLEANING UP of the valves - he's not on about lapping them in with a drill!

anyway, Juhiss is from Lapland so what's the bloody problem!!!!!!

come on lads - wake up! :lol: :lol:

regards

taffy

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