Strange sound from rebuilt engine...
03-02-2013, 01:57 PM
#301
Burning Brakes
Thread Starter
Can someone recommend a technique to remove the lifters from the rocker arms? The last time I did this I found it is difficult to get them out without damaging them.
03-02-2013, 03:31 PM
#302
Rennlist Member
Peter, I feel for you on this one. New lifters are almost impossible to remove from the rockers without damaging the somewhat fragile head. You can try cleaning the oil off the top and grabbing them with a paper towel in the jaws of a set of grommet plliers (plastic pliers). Your going to end up replacing some if you think they need to be inspected. Make sure the plastic seal at the base is not left inside the lifters that is easy to miss. (even from the original replacements).
03-02-2013, 07:14 PM
#304
Burning Brakes
Thread Starter
03-04-2013, 09:53 PM
#305
Burning Brakes
Thread Starter
Strange sound from rebuilt engine SOURCE DISCOVERED
VIEW DISCRETION IS ADVISED!
I finally found out the cause of the noise and it aint pretty.
The connector rod nuts were colliding with the very bottom of the cylinder. This created some raised ridges inside the cylinder wall which then scaped along the piston skirt. This happened on all 6 cylinders although side 1-2-3 is worse.
After removing the pistons I found the I could move the rods in and out about 1/16 to 1/8 inch. Sadly, I knew this BEFORE I put the engine back in the car. I mistakenly believed this to be normal. The use of Plastigage would have prevented this. Needless to say I am now a member of camp Plastigage.
I discussed this with Steve W. and our current theory is the nuts were not torqued down enough due to a faulty/inexpensive torque wrench. I am sending the rods up to Steve for inspection.
I am continuing with disassembly and cleaning.
I finally found out the cause of the noise and it aint pretty.
The connector rod nuts were colliding with the very bottom of the cylinder. This created some raised ridges inside the cylinder wall which then scaped along the piston skirt. This happened on all 6 cylinders although side 1-2-3 is worse.
After removing the pistons I found the I could move the rods in and out about 1/16 to 1/8 inch. Sadly, I knew this BEFORE I put the engine back in the car. I mistakenly believed this to be normal. The use of Plastigage would have prevented this. Needless to say I am now a member of camp Plastigage.
I discussed this with Steve W. and our current theory is the nuts were not torqued down enough due to a faulty/inexpensive torque wrench. I am sending the rods up to Steve for inspection.
I am continuing with disassembly and cleaning.
03-04-2013, 10:04 PM
#307
Race Director
Oh ****, ouch.
I'm confused though. 1/8th of play on the rods is obscene. Was that really just from rod bolts not quite tight enough?
what did you torque those to?
sorry to hear about the damage, but you may at least be able to save the cylinders.
I'm confused though. 1/8th of play on the rods is obscene. Was that really just from rod bolts not quite tight enough?
what did you torque those to?
sorry to hear about the damage, but you may at least be able to save the cylinders.
03-04-2013, 10:18 PM
#308
Burning Brakes
Thread Starter
Rod bolts torqued to 40 ft-lbs. And remember this is just a theory right now. The only other thing I can think of is the crankshaft is worn. Any other ideas?
03-04-2013, 10:19 PM
#309
Burning Brakes
Thread Starter
03-04-2013, 10:21 PM
#311
Rennlist Member
Are the rod bolts directional?
I see some references with them threaded in from the crank side and other references showing them threaded in from the piston side.
"After removing the pistons I found the I could move the rods in and out about 1/16 to 1/8 inch."
"In and out" perpendicular to the rotation of the crankshaft?
I see some references with them threaded in from the crank side and other references showing them threaded in from the piston side.
"After removing the pistons I found the I could move the rods in and out about 1/16 to 1/8 inch."
"In and out" perpendicular to the rotation of the crankshaft?
03-04-2013, 10:32 PM
#312
Even if the rod nuts were finger tight, you wouldn't get 1/16" play. Did you not install rod bearings?
Honestly -- and please don't take this the wrong way -- you might want to have a professional do the reassembly. If you thought having that kind of rod play was normal, well....maybe have a professional do the job this time.
Honestly -- and please don't take this the wrong way -- you might want to have a professional do the reassembly. If you thought having that kind of rod play was normal, well....maybe have a professional do the job this time.
03-04-2013, 10:34 PM
#313
Burning Brakes
Thread Starter
03-04-2013, 10:36 PM
#314
Burning Brakes
Thread Starter
Even if the rod nuts were finger tight, you wouldn't get 1/16" play. Did you not install rod bearings?
Honestly -- and please don't take this the wrong way -- you might want to have a professional do the reassembly. If you thought having that kind of rod play was normal, well....maybe have a professional do the job this time.
Honestly -- and please don't take this the wrong way -- you might want to have a professional do the reassembly. If you thought having that kind of rod play was normal, well....maybe have a professional do the job this time.