86 2H 60-series-I’ve had it about 15 years doing frame-body off restoration-literally was just getting ready for a long ‘walk about’ test drive and this occurred.
Rig has sat for over a year and always started instantly and purred-oil pressure on the higher side of specifications: when I first got it pulled oil pan and a main and rid beating to inspect and they were perfect like they’d been installed recently. Prior owner was supposedly a marine diesel mechanic-I thought he’d gone through it since it ran so tight, smooth and no smoke except startup.
Setting; rig was in shop for a couple days while I replaced broken battery clamp and turned up the fuel for more power—shop 55’F-started up and moved throttle to warmup idle of about 1,000 rpm pulled out of shop-closed door and when I went out it had just started knocking hard-louder underneath than in engine bay and sounds like near back of engine.
Reduced throttle-still knocking (not fuel knock sound nor cold diesel sound), so turned off-let it sit then started again instantly knocking sound..took another rig for errands and 1/2 hr later tried start up-knocked right away in same location; oil pressure still great….? Smoking not changed-just minimal startup smoke.
I’ve attached a short vid so you can hear/see.
?spin a rod bearing?..Or maybe mainbearing? Combustion chamber precup came loose in head?-but that would be top end noise..?—fuel system problem but then sound would be consistent-not one area?—sound is greater on bottom end.
I used to be a truck driver and recognize most sounds-rebuilt a 6.9 diesel and have done gassers—so have a descent knowledge—but tracking down problem sounds as to what they are so I can take apart the right area..
So-after 15 years of hard work, thinking I was done…im not.
I sincerely appreciate detailed input and help-Thankyou!!2H knock vid
Never attached a video before-not sure if working..
Rig has sat for over a year and always started instantly and purred-oil pressure on the higher side of specifications: when I first got it pulled oil pan and a main and rid beating to inspect and they were perfect like they’d been installed recently. Prior owner was supposedly a marine diesel mechanic-I thought he’d gone through it since it ran so tight, smooth and no smoke except startup.
Setting; rig was in shop for a couple days while I replaced broken battery clamp and turned up the fuel for more power—shop 55’F-started up and moved throttle to warmup idle of about 1,000 rpm pulled out of shop-closed door and when I went out it had just started knocking hard-louder underneath than in engine bay and sounds like near back of engine.
Reduced throttle-still knocking (not fuel knock sound nor cold diesel sound), so turned off-let it sit then started again instantly knocking sound..took another rig for errands and 1/2 hr later tried start up-knocked right away in same location; oil pressure still great….? Smoking not changed-just minimal startup smoke.
I’ve attached a short vid so you can hear/see.
?spin a rod bearing?..Or maybe mainbearing? Combustion chamber precup came loose in head?-but that would be top end noise..?—fuel system problem but then sound would be consistent-not one area?—sound is greater on bottom end.
I used to be a truck driver and recognize most sounds-rebuilt a 6.9 diesel and have done gassers—so have a descent knowledge—but tracking down problem sounds as to what they are so I can take apart the right area..
So-after 15 years of hard work, thinking I was done…im not.
I sincerely appreciate detailed input and help-Thankyou!!2H knock vid
Never attached a video before-not sure if working..
…not likely.