Causes of Melted Piston Top and Ring Land on Diesel Engines
Signs of melted piston or ring land damage include: • Erosion at the piston crown is visible. • Melted areas can be seen at the piston crown (Fig. 1) – right up to a completely melted off top of the piston (Fig. 2). • In extreme cases, there are seizure marks all along and around
Chevy 3.1L/191 Cam Bearing Bore Issues
If a new cam bearing is installed in a bore that has been damaged, it will spin in the block, cut off the oil to the cam, and cause an immediate failure. Inspect the cam bores in all of the late 3.1L castings (10137093/ 10191737/ 24504089/ 24504150/ 10224227) very carefully, paying special attention to the
Camshaft Installation and Break-In Tips
Do not attempt to operate an engine with less than .150? retainer-to-guide clearance. If you are using valve seals, check the clearance from the top of the seal rather than the top of the guide. When using a flat tappet camshaft and high pressure valve springs with more than 130 lbs of seat load or
Solutions to Common Cylinder Honing Problems
Below are some solutions to the most common honing problems. PROBLEM: Hone is not cutting • If stones are loading, you need to apply more honing oil to properly flush stones. Manufacturers such as Goodson recommend their a filtered honing oil. • Make sure that your guide blocks are not too tight. Honing stones should
Lifter Bank Angles of a Chrysler ‘A’ Block
The angle of the lifter bore is changed to help straighten out thepushrod angle. The standard lifter angle on the “A” engine is 59degrees from vertical. This points the lifter away from the center ofthe block and angles the pushrod toward the outside. Most of the blocks and some highly modified versions of the “A”
Busted Valve Lash Myth
All too often the effect of valve lash on power output is considered very much a secondary factor and a small one at that. This may be so but the ramps open the valves relatively slowly and during that period the flow, into and out of the cylinder, is little more than a nuisance leak
How to Time a Perkins Diesel Engine
Removal: First, before removing the injection pump make sure you can still see the scribe mark that Perkins put on the engine block. This can be found on the engine block just under the injection pump flange. Having a hard time finding this mark? Locate the other scribe mark on the ear of the injection
Compensating for a Cold Engine When Adjusting Mechanical Lifter Valve Lash
Engine respond to the actual movement of the valves. Since the valve cannot move until all the running clearance (valve lash) has been taken up, the amount of valve lash you use affects the engine’s performance. The alloys of certain engine parts can be affected by thermal expansion in different ways, therefore the amount of
Front Timing Cover Oil Leak Reported on Toyota 1GR-FE Engine
Some 2003 – 2007 model year 4Runner, FJ Cruiser vehicles with 1GR-FE engines maydisplay evidence of a small oil leak located where the Bank 1 cylinderhead, engine block, and timing cover meet. Use the following repairprocedure to address this condition. Note: Affects 2003 – 2007 model year 4Runner vehicles equipped withthe 1GR-FE engine produced BEFORE
Deciphering The Differences In The Chevy 2.2L Engine
Since its birth in 1990, when the old Chevy 2.0L engine was upgradedwith a stroke increased from 3.15? to 3.46?, the 2.2L powerplant hasbeen upgraded several times: the block has been revised four times andthe head has been changed three times (it was discontinued after 2003, replaced by the 2.2 L Ecotec). Let’s start in
How to Check Piston Ring Groove Back Clearance
The piston ring set and the piston must be engineered to complement each other from a standpoint of clearance between the back of the piston ring and the bottom of the piston groove. This clearance is referred to as back clearance. If the clearance is not sufficient, severe engine damage can result when the piston
Oil Pressure Regulator Valve Caution on 1984-’96 Nissan 3.0L Non-Turbo Engines
When installing a new replacement cylinder block/engine in a Nissan 300 ZX non-turbo car equipped with the 3.0L VG30 engine you’ll notice the new block/engine assembly comes with two blind plugs installed in the oil filter bracket boss on the engine block. The original engine that is removed from the vehicle has two oil pressure