Donki

[Donki]

Is there a way to put valve stem seals on without removing the head on 80 l20b motor

[datzenmike]

Yes. Set the cylinder on the compression stroke or where you can see that both valves are closed. Take the spark plug out and push about a yard of 3/8 nylon rope into the cylinder. Tie a big knot on the end. Turn the engine ahead, clockwise, compressing the soft rope against the closed valves. When tight as you can get it by hand remove the rockers, the lash pads, compress the valve springs and retrieve the two keepers and relax the spring. Pry off old seal push new ones on.

 

After #1 go to 3 then 4 then 2 and all you need do is turn the crank ahead half a turn for each.

 

This method does not require a compressor, fittings, or hoses nor an uninterrupted electrical supply to do. With rope, you could do this in the evening on the side of the road and finish the next morning with no worry of a valve falling into the cylinder..

[Donki]

is the cam in the way do u have to remove it 

[Charlie69]

Nice how yo Mike!  Been using that method ever since I was in my first freshman auto shop class.

[Crashtd420]

On 10/28/2019 at 4:01 PM, Donki said:

is the cam in the way do u have to remove it 

I would think you wanna leave the cam in..... if not you would risk losing the timing chain trying to rotate the motor....

[datzenmike]

Cam stays in. There's no way to remove it without removing the rockers first anyway. Keep the rockers in order so they go back on the same valve. Probably better to pry the valve spring down before compressing the rope and slip the rocker off to the side. Do one cylinder at a time.

 

NEVER remove the cam towers. The towers are aligned. Avoid this at all costs. The cam should slide out to the front once all rockers are removed. This should be done only if replacing the cam. 

 

 

[Donki]

Yes I got all the valve seals in the truck only has 100 thousand miles on it when the chain is on number 1 an at TDC what side of the notch should the 1 be left or right 1 side means chain is stretched then put on number 2 how do u no if it's stretched 

[Donki]

I'm getting lot of smoke our of exhaust I put a Weber carb on it can't seem to get the choke to work right electric choke the pcv valve setup not sure if it's right 

[datzenmike]

White is steam unless it's coold out and then all engines have some white exhaust.

Black is way too rich a mixture. Too much gas. Usually choke is on too much

Blue is burning oil. Bad rings or valve seals.

 

On 10/30/2019 at 5:38 PM, Donki said:

Yes I got all the valve seals in the truck only has 100 thousand miles on it when the chain is on number 1 an at TDC what side of the notch should the 1 be left or right 1 side means chain is stretched then put on number 2 how do u no if it's stretched 

 

 

Set engine accurately to TDC by turning clockwise. If you over shoot, back up and re-do. Check the relationship between the notch and the small line above it like the picture below...

 

Notch should be below and maybe slightly to the right of the line. Get this relationship and the cam is properly timed.