4.6L Triton with low compression in cyl # 4
04-12-2014, 10:44 PM
#1
4.6L Triton with low compression in cyl # 4
Hi folks
I have a '98 F150 with 4.6L Triton with low compression in cyl # 4 @ approx. 30#; all other cyl are at 140# or so. Would it be a burnt valve, bent valve, cam? Any ideas before I rip it apart?
Any harm if I drive it like that? I have not have it on the road yet.
Thanks
I have a '98 F150 with 4.6L Triton with low compression in cyl # 4 @ approx. 30#; all other cyl are at 140# or so. Would it be a burnt valve, bent valve, cam? Any ideas before I rip it apart?
Any harm if I drive it like that? I have not have it on the road yet.
Thanks
04-19-2014, 07:07 PM
#2
While holding the crank shaft with a Johnson bar, I put air in the cylinder with piston all the way up; the air would give the piston a good jolt. I moved the piston up & down several times while pressurized with air; at one point, lots of air came out from the oil fill hole. I inspected with my Borescope and found something weird on the piston that I can't figure out what it is.
It's the best picture I could get. Does that look like a damaged piston or what the heck is it?
It's the best picture I could get. Does that look like a damaged piston or what the heck is it?