Winnipeg Free Press - PRINT EDITION

Defective seals often cause leak in steering rack

Check boot vent tube to determine if it's letting dirt, moisture inside

  • Print
QUESTION -- What could be causing our steering rack to leak and have to be replaced twice in 48,280 kilometres?

We have a 98 Grand Caravan that was modified new for wheelchair access, by lowering the floor. The modified vehicle is a few hundred pounds heavier than the vehicle before modification. The Chrysler dealer suggests that the steering rack wears out because the van is raised at the rear to improve clearance under the lowered floor. The van was involved in a minor collision in 2001 that resulted in a cracked front bumper. Thanks in advance for your consideration.

ANSWER -- Two problems typically occur with steering racks. First, there is an internal seal leak on the piston that allows fluid to leak from one side of the piston to the other. This causes harder steering because the power assist is being bypassed. The second problem is an external seal on the steering rack that falls and allows oil to leak to the outside. Problems can also occur in the hydraulic control valve area of the steering rack, but these are rare. Regardless of the problem, the typical repair is to replace the steering rack with a rebuilt or remanufactured unit. Few shops actually disassemble steering racks for repair.

To help determine why the rack needed replacement a second time, we should look at why it failed the first time. The extra weight of the vehicle may place a slightly higher load on the rack, but this would occur only when the wheels are being turned with the vehicle stationary. Even this should not cause a real problem, as the van was designed for maximum passenger load and I doubt if you operate it this way most of the time. The raised rear end also should not cause a problem with the rack, although it would change steering angles slightly. I suspect the first failure may have been just bad luck, but the minor collision may have had something to do with it.

I often see vehicles that have been in collisions that had no obvious damage to the steering but were hit hard enough on a tire or wheel to damage something in the steering or suspension. Winter accident damage may not show problems until there are smoother roads and better traction in the spring.

The second failure could be related to the first. If the oil in the steering was contaminated with metal particles from the first failure, it should have been flushed before a new rack was installed. Check the power-steering oil and if it appears grey or has small metal flakes in it, then it needs changing. The second failure could also be caused by a steering-rack boot vent tube that was not securely in place, allowing dirt and moisture to get in. Unfortunately, this would be difficult to determine unless you saw it at the time the rack was replaced. Again, the second failure may have been just a case of bad luck.

QUESTION -- My daughter owns a 1990 Z24 Cavalier with 3.1-litre engine and auto trans. The timing chain broke and the valves bent. We would like to know if there would be any problems with taking a 3.1-litre engine out of a 1992 Pontiac Sunbird with 3.1-litre engine and auto trans. Any information you could provide us would be greatly appreciated.

ANSWER -- These two engines have a different option code number but appear to be mechanically basically the same. Unfortunately, shop manuals and interchange manuals don't tell you all the exterior differences, so the best method is to visually look carefully at the two engines. There may be some minor differences in throttle cable brackets or accessory mounts, but these should be easy to swap.

The wiring harnesses for the two engines are slightly different. I would keep the original harness with the vehicle and swap any sensors that have different connectors. The location of the oil-pressure sender appears different too. There should be a plug in the block of the Sunbird engine that can be removed to install the Cavalier oil sender. You can remove and plug the Sunbird pressure sender if you wish, but it is not necessary.

Almost all engine swaps require small changes and sometimes major ones, such as swapping oil pans. Your swap appears to be relatively easy.

Jim Kerr is an experienced mechanic, instructor of automotive technology and freelance journalist. You can e-mail questions to Jim at the address below.

kerr.jim@sk.sympatico.ca

Republished from the Winnipeg Free Press print edition June 13, 2003 $sourceSection$sourcePage

Fact Check

Fact Check

Have you found an error, or know of something we’ve missed in one of our stories?
Please use the form below and let us know.

* Required
  • Please post the headline of the story or the title of the video with the error.

  • Please post exactly what was wrong with the story.

  • Please indicate your source for the correct information.

  • Yes

    No

  • This will only be used to contact you if we have a question about your submission, it will not be used to identify you or be published.

  • Cancel

Having problems with the form?

Contact Us Directly
  • Print

You can comment on most stories on winnipegfreepress.com. You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

You can comment on most stories on winnipegfreepress.com. You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

Have Your Say

New to commenting? Check out our Frequently Asked Questions.

Have Your Say

Comments are open to Winnipeg Free Press print or e-edition subscribers only. why?

Have Your Say

Comments are open to Winnipeg Free Press Subscribers only. why?

The Winnipeg Free Press does not necessarily endorse any of the views posted. By submitting your comment, you agree to our Terms and Conditions. These terms were revised effective April 16, 2010.

letters

Make text: Larger | Smaller

LATEST VIDEO

In the Key of Bart: Can’t It Be Nice This Time?

View more like this

Photo Store Gallery

  • Marc Gallant / Winnipeg Free Press.  Local/Weather Standup- Catching rays. Prairie Dog stretches out at Fort Whyte Centre. Fort Whyte has a Prairie Dog enclosure with aprox. 20 dogs young and old. 060607.
  • Hay bales sit under a rainbow just west of Winnipeg Saturday, September 3, 2011.(John Woods/Winnipeg Free Press)

View More Gallery Photos

Poll

What are you most looking forward to this Easter weekend?

View Results

View Related Story

Ads by Google