Question about 1997 Toyota Tercel

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Service manual for 97 Toyota Tterecel said to replace pistons if there is any lateral movement of the connecting rod/pin assembly Why is this critical? and How do you remove the piston pins from the connecting rod?

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Well, any lateral movement of the connecting rod with the piston is not acceptable because it could wear to the point of being thrown apart over time.

Also, pins can be pressed out, I believe, even though I have never done this.

I have overhauled a 1979 Honda Accord and took the pistons out, but the machine shop said that they were ok, at the time.

Posted on Jul 04, 2010

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Making knocking sound


A KNOCKING SOUND IN THE ENGINE IS MOST LIKELY CAUSED BY ONE OF THE FOLLOWING
1. PISTON SLAP: Makes a sharp metallic noise. Idle engine and short out each cylinder plug. The noise will disappear when plug with bad piston is shorted. Noise will also disappear at acceleration. This can be caused by worn or out of round cylinder, or broken piston ring. Correct problem by re-boring cylinder and/or replacing piston.
2. VALVE NOISE: Makes clicking or rattle noise. Caused by excessive wear on valve stem or lifter, out of adjustment, or stuck valve. Correct by adjusting valve clearance, replace worn valve or lifter, regrind cam, replace valve guide and /or valve. A stuck valve can sometimes be loosened by passing oil through the carburetor while engine is running.

3. ROD BEARING KNOCK: Makes sharp metallic noise similar to a piston slap. Detection is opposite of piston slap. Rod knock is not heard at idle. Knock becomes louder as engine speed is increased. Caused by excessive rod bearing clearance. Correct by adjusting rod bearing clearance to .0015 inches by removing shims. May require re-pouring rod bearing.
4. REAR MAIN BEARING KNOCK: Makes dull knocking or thud noise. Detected at speeds between 20 and 50 MPH. Knock will normally decrease or disappear while pulling or decelerating. Noise will be detected the loudest at normal driving speed, when not pulling or decelerating. Correct by adjusting bearing clearance to .001 to .0015 inches. If knock is excessive, crank should be checked for out of roundness. May need to re-pour all main bearings to correct.
5. TIMING GEAR KNOCK: usually the most difficult to diagnose. If gear is loose or badly worn it will knock in all ranges. Run engine slightly above idle speed. Slowly open and close throttle. Knock will continue to be present, but just as engine slows down knock will become a slight rattle. Remove timing pin and reinsert into timing hole on timing gear cover. Press timing pin tightly against timing gear and accelerate slightly above idle. Knock will significantly be reduced or disappear. Correct by replacing both timing gear and crank gear as a matched set. The two gears should have a backlash clearance of .003 to .004. If more than .009 inch backlash, an oversize (.005) timing gear should be installed.
6. WRIST PIN SLAP: This can not be detected by shorting out the cylinder plugs. Rapidly accelerate and decelerate the engine speed. The engine will pass through a certain speed range when the wrist pin will rattle at about the same pitch as a valve tappet noise. This can be corrected by installing a new wrist pin bushing in the rod or new wrist pin f badly worn. Wrist pin should fit the piston and connecting rod with a tight metal to metal fit. The pin can be pushed into the piston and rod with a slight pressure of the hand. Pin to rod clearance is .0003 to .0005 inches.

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Here's the scoop.
Underneath that piston is a wrist pin, and then a connecting rod, and then a bearing that goes around the crankshaft. The bearing is split into two pieces, upper and lower. Some folks have put the engine together, as you wish to do. The top of the piston is engineered to be a certain way. if there is a tiny imperfection, what might (maybe) happen is pre-ignition, if that part of the piston heats hotter than the surrounding surface, and will cause the engine to run poorly. Next, if the valve hit the piston, there might be some tiny damage to the connecting rod, the wrist pin, or mainly, the bearing on the crankshaft. Probably all you would see is the engine would throw a rod in the next 5,000 miles, or sooner.
I share your desire to save money and time on this. If you decide to button it up, please take some fine sandpaper and a good shop vacuum and try to smooth the imperfections in the top of the piston and vacuum all dust and shavings up as you work.
Be blessed.

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If you have a spun bearing or broken rod, the entire engine needs to be removed, completely torn down and all passages flushed...far easier to replace engine with a good used one.
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