2519 Dana Drive, Laurinburg, NC 28352 USA · Telephone: 910-276-4853
Toll Free: 1-800-782-3379 | Fax: 910-276-1354
info@rostratransmission.com · www.rostratransmission.com

Rules and guidelines for replacing or reusing solenoids

1. Absolutely replace solenoids when:

Hard parts fail
Pan magnet is fuzzy
There's much contamination
High mileage
Harsh driving conditions
Discolored coil wire
Hardened seals
Brittle plastics
Nicked coil wire
Poor electrical connections
Alterations to original product

2. Replace or Re-use Considerations

The decision to replace or re-use is a business decision that must be made on an individual basis.

What is the warranty period offered with the job?
Will the used product operate satisfactorily through the transmission warranty period?
How does the cost savings of re-using a solenoid compare to the cost of a comeback?

3. Predicting remaining life of original solenoids

Can the remaining life of the solenoid be estimated based on vehicle miles and transmission condition?
Decision to re-use should be made while original vehicle is in the shop to determine mileage and conditions
Used solenoid should not be thrown in a bin for review or re-testing later.
Testing can not determine the useful life remaining in a product.
Some testing is better than no testing.
Most testing methods, equipment do not represent realistic conditions

4. Considerations

Cost of new solenoid
Cost of testing used solenoid
Amortized cost of test equipment
Cost of R and R if used solenoid is bad
Cost of other parts damaged by the solenoid failure
Cost of comeback

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