I took apart my old engine to part it out. and I was wondering why the compression test results were so low, and it was overheating before I swapped it out.

When I got the head off, I found in the #1 cylinder a pool of oil in the bore, and the intake valves were white. unlike the other three cylinders which were all black.

Also, the headgasket looked fine, Anything in particular I would notice in the event it was blown?

the Cylinder walls were scratched, but not too badly. I could still Identify the crosshatch patter.

Another strange thing. the two intake valves on the #1 cylinder, and the two exhaust valves on the #4 cylinder were both cracked open while all the other valves were shut.

If anyone can make some sense out of this let me know

 

"The two intake valves on the #1 cylinder, and the two exhaust valves on the #4 cylinder were both cracked open while all the other valves were shut"

I'm assuming they were "cracked open" after you removed the camshaft from the cylinder head? In which case that's bent valves. Maybe you over-revved it on a downshift. Did it have a lumpy idle?

Unusual to bend the exhaust valves (#4 cylinder) without bending the inlets (as the inlets valves are larger diameter, but it can happen. The white deposits are most likely burnt oil. I'd guess the #1 piston could have a small crack in it from where the valves hit.

LX02

"But Lisa...just because I don't care doesn't mean I don't understand!" -Homer J. Simpson


[Modified by LX02, 12:02 PM 12/10/2001]

 

Dammit drag, what the heck are you doing?

I concur with LX02. Look over the #1 piston and see if there are/is any cracks. If not, compair the head and block by around the area and see if there is any warpage, heat is hell and of course makes the metal soft so you are going to warp something.

Why were you overheating? Leak or is the radiator just too small?

 

I did not remove the camshaft, I just unbolted the head. the exhaust valves I'm assuming are normal to be open because the #1 and #4 were at BDC

but I think that the #1 cyl intake valves were either stuck open, or bent. I'll take a closer look @ the pistons, but they did not appear to have any sign of damage.

 

Did you try turning the cam with your hand on the cam gear, and see if the #1 intake valves close any more, and if they do close anymore, if they close all the way?

 

I would rotate the cam through the whole cycle and see if the valves close... they should if not.. then you know the problem..
it it over heated you could have warped your head.

 

Yeah, I couldn't budge it...should I be able to move the cam by hand?

 

Probably not..
put a big *** wrench on it......
be carefull..
it'll be really hard for abuot 45 degrees.. then it will turn really easy for about 1/2 turn..
then it will get be hard to turn again.. so watch your knuckes..

 

I'll give that a shot...so it should be like the turning the crank then...hard then easy....

 

Yes. Next time you want to turn the crank, take the plugs out! I learned after a few nuckle bashes.

 

yeah..
i..

hard then easy..


but mostly hard


[Modified by Crazydave, 8:13 PM 12/10/2001]