Valve spring replacement

[youngone]

How hard is it to replace valve springs? I have a broken valve spring and I wanna replace it but, I have never done it before. All the shops I called say that just replacing one isnt a good idea, it's best to replace them all. Is this something for a novice or is it better left to the pro's?


BTW, what the hell is a 3 angle valve job? This shop wants $90 for a 3 angle valve job plus the cost of the spring.

P.S. Anybody in the Wilkes barre/Scranton area know of a shop or person who will rebuild my head(s) for a cheap price?

 

[Aryan15]

Valve springs

If one broke it would be a good idea to replace all of them. I don't know why one would just break but its really not too bad. You just have to pull the upper intake and all the hoses, wires, etc that go along with it. Then pull the valve covers to get to the rockers and springs. Whatever valves you start with, you need to put that cylinder on a compression stroke or whenever you see both valves close. You need an air compressor and a spark plug adaptor to pressurize the cylinder to keep the valve from falling into the cylinder. Now pull the rocker arm nut, remove the rocker arm, and then use something to depress the valve, pull the two keepers out and pull the springs. Make sure you also hold the crankshaft from turning such as putting in gear or something. As for the three angle grind, they are talking about where the valve meets the valve seat in the head. It is how many chamfers are on the valve and seat. Hope it helps.

 

[txstang84]

purely my opinion, but if you broke a spring, there's possibly some other things wrong with the heads...i'd take them to the shop and get the 3 angle valve job...stock valve seat angle is 45*, w/ a 3 angle valve job, they cut the seats at 30*, 45*, and 60*, this allows the a/f mixture to more smoothly transition into the combustion chamber which will increase hp and torq. or, you can stop gap fix it by replacing the springs and save up for a new set of heads...


add'l info: when they're at the shop, they'll probably also mag the heads, and shave them if necessary...in conjuction w/replacing the springs, they'll ensure the springs are installed at the correct height, and pressure within specs. they'll also lap the valves and after assembly, they'll pressure ck them to ensure the valves sealed up against the seats...not to mention cleaning them...they come back to you all prettied up..

 

[youngone]

Great info, thnx. I am haveing the machine work done.

 

[youngone]

1 more question, what valve springs would you guys ecommend for an f-303 cam? The shop I talked to said either they are worn out or my cam is too strong for the stock springs.

 

[youngone]