Question about 2006 Ford F 350 Super Duty

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Can crankshaft bearing and crankshft be changed from bottom end

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Well, possibly, but it is difficult to porperly measure anything from there. If you have crank bearings that have issues, pull the engine. Much easier

Posted on Jul 28, 2010

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Posted on Jan 02, 2017

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3.1L has rod knock. I have 20yrs of auto mechanic and built a few engines, but retired now.


If the knocking is from the bottom of the engine, it may be the big end bearings have worn.
Replace them or not? Difficult question.

Replacing the big end (crankshaft/piston rod) bearings may stop the knocking/rumble noise. It depends on the crankshaft..

If the crankshaft has worn oval on its journals, fitting new bearings is unlikely to achieve anything as the bearings may break up due to the oval of the crankshaft. Removing the crankshaft and checking the journals for ovality/regrinding if necessary isn't a 5 minute job.

You say you have good oil pressure. That's a positive.

Personally, in your situation, I would try an engine oil additive that's designed to eliminate knock provided the main bearings haven't worn down to base metal. It's the cheapest option.

Failing that - and again, personally - I would remove the oil pan and fit new big end bearings in the hope that it would work.

The next step, if that doesn't work - would be to remove the crankshaft and have it reground and fit oversize bearings. Or get a 2nd hand engine...

You say the car was given to you for free .. you have nothing to lose. Try an additive first.. molyslip/molybdenum or whatever...

Good luck ...

May 21, 2016 | Cars & Trucks

1 Answer

What is the big end bearing settings on a ford laser 1.6 1996 model


Hi there
Big end bearings are set when you get them as they are set to the crankshaft grinding so you buy bearings with the crankshaft OR stamped on the bearing shell is the o/s [like 020u/s or 020 o/s
but if the crankshaft is worn at all then dont put any bearings on it untill its been ground.

Nov 09, 2014 | Ford Laser Cars & Trucks

1 Answer

Loud knocking when driving and especially when i go up steep hills it starts smoking and there is oil all over the bottom part of the engine


Not good news here. I think you have a failed con-rod big-end bearing. Repair usually involves taking out the engine, replacing or regrinding the crankshaft, and replacing all the bottom end bearings.
You may be best off obtaining and fitting a reconditioned or plain second hand engine.
Compare the cost of this with a newer second-hand car.

Apr 21, 2012 | 1995 Mercury Villager

1 Answer

How do I tighten the vibration dampening pulley on the end of the crankshaft? 3.4 engine Replaced the belt and belt tensioner, still squeals and belt does not run true on tensioner pulley. Vibration...


Using a air impact gun would be quick and simple. Check the pulley, sometimes the rubber seperates from the actual pulley. Crankshft pulleys usually don`t walk off. I think it seperated. Have your service shop take alook..

Feb 19, 2011 | 2001 Chevrolet Impala

1 Answer

2002 audi tt 225 bhp cranksharft torque settings


Crankshaft torque settings for 2002 Audi TT 225 BHP:

1. Main bearings: Renew bolts = Yes
2. Main bearings: Stage 1 = 65 Nm
3. Main bearings: Stage 2 = 90 degrees
4. Big end bearings: Renew bolts / nuts = Yes
5. Big end bearings: Stage 1 = 30 Nm
6. Big end bearings: Stage 2 = 90 degrees
7. Flywheel / driveplate = 60 Nm + 90 degrees (use new bolts / nuts)
8. Crankshaft pulley / damper centre bolt = 90 Nm + 90 degrees (use new bolts)


Nov 25, 2010 | Audi TT Cars & Trucks

1 Answer

Timing belt crankshft postioning


the little dot on the crankshaft sprocket has to be aiming staight up and you will also need to remove the #1 spark plug to make sure the piston is at top dead center.you can check if it is all the way up by using a long,thin screwdriver and putting it in the spark plug hole.if the piston is not all the way up.you will need to turn the crankshaft 1 whole turn clockwise and stop when the dot on the sprocket is aiming up agin.the piston should now be at top dead center.i hope this information helps.take care and good luck, manny

Jul 11, 2010 | 1994 Toyota Corolla

1 Answer

04 corolla. Oil light comes on. Full of oil.


the oil pump on any car is rarely the cause of low oil pressure. if you remove the oil pressure sending unit and install an oil pressure gauge,even the type you can buy as an add on,and the reading you get is low.the problem is genrally worn out main crankshaft bearings.to avoid unneseary replacement of these,you should buy some plasti-gauge from an auto part store remove the bearing caps one at a time and measure the clearance this way.there is a risk here because the smallest grain off dirt that getts into the bearing, crankshft will ruin the bearing when you restart it.if these are worn out you probabably shoul consider replacing the engine because the other bearings are probably also worn out by this time.

Feb 15, 2010 | 2004 Toyota Corolla

2 Answers

MY NISSAN IS MAKING A KNOCKING SOUND COMING FROM THE BOTTOM OF THE ENGINE WHAT CAN BE THE PROBLEM


Knocking sounds in the lower engine area usually are from loose/damaged connecting rod bearings. Repairs are centered around resurfacing or replacing the crankshaft and the associated bearings. (many penny!)

Oct 27, 2009 | 2002 Nissan Pathfinder

1 Answer

Fuel in oil, rover 3.9 v8


if your rocker shaft was busted and the valves were not opening, alot of the unburned fuel in those cylinders will end up in the crankcase. the problem is that fuel dries things out and hinders lubrication, the crankshft and camshaft bearing and journals can become damaged. fix your rocker, put fresh oil in, then change it a second time after about an hour of running, use a quality oil additive like MOA or Lucas stabilizer in the second change. low oil pressure can indicate worn crank and cam bearings and or journals.

Mar 08, 2009 | 1994 Land Rover Discovery

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