The Ford Barn

chrs1961815 · 07-16-2021, 11:47 AM

Okay so here is another update:
Engine completely disassembled and we discovered that all the bearings and the crank had been scored along with some of the cylinders and pistons. Mains are OK. Cause is oil not getting to those plays but the passages are all free and the pump appears to work well but needs to be taken apart for sure. One thought that I hope somebody can answer is about my oil pan. I have the first design oil pan with the screw in dipper tray - is this dipper tray lower than a regular pan? That would cause no oil to come to the bearings.

nkaminar · 07-16-2021, 07:13 PM

Chris,

It seems like you may have found your problem. You may be able to use a borescope to see if the dippers are reaching far enough into the tray. You can knock the breather tube out of the engine. It is a tight fit.

It is normal to have 1/8 inch front to back clearance between the big end rod bearings and the rod journals. A bent rod will push the big end of the rod back and forth and bang into the journal shoulders. The geometry is not obvious. A straight rod will just stay in one place even with the clearance. The only reference I could find that mentioned the back and forth movement of the rod if bent is https://www.mtfca.com/discus/message...tml?1500638368.

jm29henry · 07-16-2021, 07:23 PM

Is it possible that you’re intake and exhaust manifold and intake are not machine correct as no makings a good seal hence hard starting noise and poor running

katy · 07-17-2021, 10:37 AM

Are the rod cap dippers facing the proper way? That is, towards the camshaft?

chrs1961815 · 07-17-2021, 09:58 PM

Yes the dippers were facing the right way.

I think I am on to the cause of why this happened, need some more research!

07-16-2021, 11:47 AM	#61
chrs1961815 Senior Member Join Date: Jul 2018 Location: Spring Grove, Illinois Posts: 1,371	Re: Mystery Engine Knock Okay so here is another update: Engine completely disassembled and we discovered that all the bearings and the crank had been scored along with some of the cylinders and pistons. Mains are OK. Cause is oil not getting to those plays but the passages are all free and the pump appears to work well but needs to be taken apart for sure. One thought that I hope somebody can answer is about my oil pan. I have the first design oil pan with the screw in dipper tray - is this dipper tray lower than a regular pan? That would cause no oil to come to the bearings. __________________ "The more things change, the more they stay the same."

07-16-2021, 07:13 PM	#62
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,897	Re: Mystery Engine Knock Chris, It seems like you may have found your problem. You may be able to use a borescope to see if the dippers are reaching far enough into the tray. You can knock the breather tube out of the engine. It is a tight fit. It is normal to have 1/8 inch front to back clearance between the big end rod bearings and the rod journals. A bent rod will push the big end of the rod back and forth and bang into the journal shoulders. The geometry is not obvious. A straight rod will just stay in one place even with the clearance. The only reference I could find that mentioned the back and forth movement of the rod if bent is https://www.mtfca.com/discus/message...tml?1500638368. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

07-16-2021, 07:23 PM	#63
jm29henry Senior Member Join Date: Sep 2010 Location: michigan Posts: 1,126	Re: Mystery Engine Knock Is it possible that you’re intake and exhaust manifold and intake are not machine correct as no makings a good seal hence hard starting noise and poor running

07-17-2021, 10:37 AM	#64
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,043	Re: Mystery Engine Knock Are the rod cap dippers facing the proper way? That is, towards the camshaft? __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

07-17-2021, 09:58 PM	#65
chrs1961815 Senior Member Join Date: Jul 2018 Location: Spring Grove, Illinois Posts: 1,371	Re: Mystery Engine Knock Yes the dippers were facing the right way. I think I am on to the cause of why this happened, need some more research! __________________ "The more things change, the more they stay the same."