Tech Tips	Pilot Bearing	August / September 1997
	Wheels for older Volvos	June / July 1997
	Brake Fluid	April / May 1997

RE: Pilot Bearing The pilot bearing is an inexpensive but vital part of your Volvo's drivetrain. It is also easily overlooked, and it's failure can masquerade as a variety of expensive transmission or clutch problems. The pilot bearing is located in the rear of the engine's crankshaft, and supports the forward end of the transmission's input shaft. Wear in the pilot bearing places undue loads on the input shaft bearing, the junction of the input and output shafts, and, ultimately, the output shaft bearing. The pilot bearing is also exposed to any dirt and moisture present inside the bellhousing. I would strongly recommend that you inspect it and consider replacing it any time you have the transmission out of the car -- certainly whenever you replace a clutch. It costs only a few dollars and is readily available from most Volvo parts suppliers. There are a number of tools and techniques used in extracting an old pilot bearing -- I use a slide hammer, which is primarily a body working tool. Check your shop manual for suggestions on how to replace this important part on your particular Volvo. RE: Wheels for older Volvos Tired of those skinny tires on your 1800S, Amazon or PV? You will need new wheels -- putting wider tires on the stock wheels is neither safe nor effective. There are several good answers to the problem. If you want to stick close to the stock look, you should be able to find a wheel shop that can weld wider rims onto your stock centers. The difference in appearence will not be striking, and you can use the original hubcaps or wheel covers. You may have heard that Ford or Chrysler wheels will fit a Volvo. This is true for the older cars -- the 1800E, 140 and newer cars use a bolt pattern unique to Volvo. Most 5-bolt Ford wheels that you'll find in salvage yards are 14" wheels, and you'll probably want 15", so be prepared to search a bit. Wheels from 1970's full-size Fords and Mercuries will most likely be what you'll find. They can look good with a little cleaning and paint, but are quite heavy. Of course, there are a number of alloy wheels available on the market (if they don't list wheels for Volvo, tell them you need them for a '70s full-size Ford!) Whatever wheels you decide to use, try to stick with the stock rearset: the inboard edge of the rim should extend 3-1/2" from the mounting surface of the wheel (in other terminology, a 6"-wide wheel should protrude 3-1/2" inboard and 2-1/2" outboard, which is a positive offset of 1"). The idea is not to widen the track of the car by much -- it will hurt the handling, wear components faster and wreak havoc with the alignment settings. Wider is not better, unless it was originally designed into the car. If you want to maintain the stock ride height and speedometer readings, your tire dealer can match the diameter of the original tires with wider, lower-profile ones. This will affect your selection of rims: a 185mm tire fits happily on a 6" rim, a 195mm on a 6-1/2" and a 205mm on a 7". I much prefer having a moderate tire on a wide rim than the other way around. Consider also that the more rubber you have on the ground, the lower your optimum tire pressures will be and the heavier the steering will become. Happy rolling! RE: Brake fluid Problem: Regular DOT type 3 or 4 brake fluid attracts moisture from the atmosphere, degrading the fluid and causing corrosion in brake and clutch cylinders. Girling clutch cylinders are aluminum and are especially prone to this problem. Silicon fluid does not attract moisture and holds up to the high brake temperatures involved in racing, but it has three drawbacks: it is expensive, requires a complete drainage and cleaning of your hydraulic system before installation, and it rapidly rots out the brake light switch on those cars equipped with the fluid-activated model. I can personally attest to this (at great length). Solution: Castrol LMA (stands for "Low Moisture Activity") fluid does not corrode cylinders or brake light switches, requires only a flushing of the type 3 or 4 fluid from your system, and is inexpensive. I don't know how suitable it is in a racing application, but I recommend it highly for street use. Back to the Top