Oil Leak From Front Timing Cover Reported on Some 2005-2006 Toyota 2GR-FE Engines
Use the repair procedure below to diagnose and correct this condition. Repair Procedure 1. Inspect the location where the Bank 1 cylinder head, engine block, and timing cover meet for signs of an oil leak. 2. Use an oil dye to confirm the source of the oil leak. 3. Remove and reseal the timing cover
Why Replace Oil Pump Intermediate Shafts?
The material worn off all goes to the oil pan where some is washed out during the oil changing process, but a portion goes through the oil pump and to the filter. Pushing grit through the oil pump puts an additional load on the oil pump intermediate shaft. The photos in Figures 1-2 show the
Audi/Volkswagen 1.8L DOHC Gasoline Engine Valve Failure Caution
Reviews of these problems, which are leading to breakage of the valves, and in some cases catastrophic failures, are related to problems not with the valves themselves but the method of cylinder head overhaul and re?claimed mating components. Many of the breakages examined are occurring very shortly after a rebuild and appear to mainly be
Advantages of Using an Aluminum Flywheel
By Sam Logan Using aluminum sheds 10-15 lbs. from the rotating assembly of a conventional steel flywheel, but it is the effect the weight loss has on the moment of inertia – the measure of an object’s resistance to changes to its rotation – that contributes the real gains. The lower moment of inertia in
Phaser-Style Variable Valve Timing System Controls and Operation
By Matt Dixon, assistant professor, Southern Illinois University Vehicles with variable valve timing (VVT) have become commonplace over the last decade. Even more commonplace are engines that use a phaser to manipulate camshaft position and, hence, valve timing. (See Figure 1.) The phaser style of VVT is the focus of this article. Figure 2: The
A New ‘Finish’ in Honing
For years, engine builders have been honing cylinders with a coarse stone followed by a finishing stone. Then ring materials changed, requiring an additional very fine finishing stone to follow. Now current technology demands an added step to create an even cleaner, burr-free finish. However, even with these conventional honing techniques, peaks of folded and
Oil Seepage from Cylinder Head on BMW E36 with M42 Engine
The leak is located around the lower mounting bolt (1) for the intake manifold support bracket is between the M6 threaded hole for the timing chain tensioning rail mounting and the M8 threaded hole for the intake manifold support bracket (see illustration). On M42 engines produced since approximately April of ’93, the lower mounting bolt
Common Causes of Water Pump Failure
1. Failure Symptom: Seal Leakage-Dirty System Evidence of seal leakage from weep hole (Figure 1) – This pump has been in service only a short time before rusty-looking coolant began to leak out of the weep hole, leaving behind large deposits of rust and calcium. Figure 1 shows a buildup of rust particles with a
Spiral-Reamed Valve Guide Misconceptions
The spiral inside the guide is there to hold oil and aid the lubrication of the valve during engine operation. To prevent excessive oil consumption, the threads stop approximately 7 to 10 mm from the bottom (combustion chamber) of the guide in most applications. However, there are applications where the spiral-ream is the total length
Audi 2.8L V6 Rear Crankshaft Seal Leaks After Replacement
This condition affects 1996 A4 with 2.8L V6 (Engine Code AFC). When replacing the seal, the new seal is supplied pre-installed in the flange. Seal/Flange P/N: 078 103 171H Flange gasket P/N: 078 103 181 (must be ordered separately). Caution: Part numbers are for reference only. 1) Carefully remove installation tool that comes with seal
Checking Compression Ring Gaps
Minimum gap tolerances must be observed in order to prevent the ring ends from butting together as the ring expands when the engine approaches operating temperature. It is recommended that you use a minimum gap of .0035? per inch of cylinder diameter. Example: 4? (bore) x .0035 = .014 minimum gap. Maximum ring gap is
Why Do Mass Air Flow (MAF) Sensors Fail?
Drivers often notice sluggish performance,rough idling, poor acceleration or even stalling. There may also be a morefrequent need to refuel. Contamination could even occur as early as at every18,000-25,000 miles, depending on the vehicle model. For example, with small orcompact cars, the MAF sensor can clog quicker, as it is placed in a smallerengine bay