Most of the engine accessories must be removed to assess the timing cover. This means drai
British sports-car owners expect to see oil spots on their concrete. Like fast food and cholesterol, this comes with the territory. Fortunately, American engine-sealing technology makes newer Detroit Three trucks and 4x4s fairly leak-free. For engines that do spring seeps, aftermarket gaskets and goops offer enduring fixes.
Top-engine lube-outs are comparatively simple. Down-low leaks are another issue, though. Engine front and rear seals and oil pan gaskets aren't as easy to change as the average valve-cover gasket. Timing cover gaskets and seals are also more-challenging.
Because the Proform timing cover replaces an OE one with a welded-on pointer, we also need
After living with minor leaks for years, we were finally motivated by petroleum's premium price to address timing cover leaks on a '77 Chevy 3/4-ton. We previously fixed leaky valve covers with premium Fel-Pro gaskets and Proform black crinkle valve covers (part of an engine dress-up kit that also includes a timing chain cover as well as an air cleaner). Being pragmatic/lazy, we delayed installing the timing cover and fixing the lower front-engine leaks until the coolant needed to be flushed. Here are some tips.
•On some models and years, the oil pan might need to be lowered to install the timing cover and new front seal. This can involve removing the distributor cap, undoing the motor mount bolts, and raising the engine with a cherry picker to create oil pan clearance. Hope for the best, but plan for the worst: Buy a new oil pan gasket and rear main seal before diving in.
•Measure the distance between the existing harmonic balancer and the engine block for accurate reinstallation. Otherwise, the pulleys might not line up.
•Shop manuals recommend gasket sealers and dabs of RTV silicone at strategic points. Many pros prefer Permatex No. 2 Form-A-Gasket Sealant.
•Suspect accessories, such as the water pump, alternator, balancer, or steering pump, are convenient to replace in conjunction with doing the timing-cover job.
•Chevy timing pointers vary depending on vehicle and year. GM changed from bolt-on to weld-on pointers in 1986. An aftermarket timing cover might also need an aftermarket pointer.
•Inexpensive test strips assess coolant condition. All coolant should be secured from kids and pets, and contaminated antifreeze should be disposed of properly.
Highly caffeinated Chevy Gen I small-block owners can possibly complete the job in about half a day, particularly if their engines don't have smog pumps or A/C compressors cluttering up access. We spent a weekend steam-cleaning away caked-on block grime and painting, breaking, and replacing engine accessories before reinstalling them. The result is a comparatively sano engine compartment and a driveway that's finally worth pressure washing.
Removing the harmonic balancer requires an appropriate puller. Our smog-pump pulley also h
We used Permatex No. 2 Form-A-Gasket Sealer to secure the front engine seal to the timing
The shop manual recommends lowering the pan a few bolt threads for some years and models.
Proform makes a special harmonic balancer tool (as well as a combo puller/installer) that
The timing cover is torqued to spec, star-pattern/side-to-side style. Proform timing assis
The existing long-neck water pump worked but was at least 15 years old. We replaced the ir
26555 Northwestern Highway
10 Columbus Boulevard
Proform Parts (Specialty Auto Parts U.S.A.)
26708 Groesbeck Highway