The head I am rebuilding came from that grenaded K20. This is what it looked like a year ago...
If you look closely, you can see the damage that occurred from PTV (piston-to-valve) contact. I sent the head to a local machine shop for the following treatment:
1.) Pressure wash and hot tank.
2.) Deck the head surface.
3.) Replace damaged seats.
4.) Replace damaged valve guides (with OEM Honda units).
5.) 5-angle valve job.
6.) K-Line bronze-phosphor valve guide sleeves installed.
Here is the head, back from the machine shop and ready for assembly...
Since I will be using OEM Honda cams, all new spring bases and keepers were purchased from a local dealership...
These K20Z3 springs and retainers that I picked up for $60 will be ideal for the build...
Supertech flat-faced valves...
New OEM Honda seals, soaking in clean oil prior to installation. Please note that the intake and exhaust seals are different. Exhaust seems thicker to me (to handle the heat???). They are differentiated by color of the tiny spring. Silver is intake, black is exhaust. Don't mix and match...
The spring bases get dropped in now...
I must have forgotten to take a photo but you want to lightly coat the valve stems in oil before you slide them up into their guides. I used a wadded cloth towel in the combustion chamber to keep the valves up while installing the springs. If you were doing this in-car, compressed air would do the same thing. I recommend doing the valves in pairs. It makes things easier.
Once the valves are in, we can install the valve stem seals. You can use a socket to drive them on but this pair of pliers is the proper tool...
To be continued....
Bookmarks