Give a grooved balancer hub a fresh surface for the timing cover seal to ride on with the National Engine Timing Cover Harmonic Balancer Sleeve, part number 88187. It is cataloged for 735 applications. These include the 1962-1968 AC Shelby Cobra (V8-4.7L), the 1964-1968 Ford Mustang (V8-4.7L), the 1971-1974 DeTomaso Pantera (V8-5.8L) and the 1975-1996 Ford F-150 (L6-4.9L, V8-5.0L). See the Buyer's Guide tab for the full list.
Over time, the lip of the timing cover seal can wear a groove into the harmonic balancer's sealing surface. This sleeve installs over that worn area and gives the seal lip a new surface to contact. If the hub's sealing surface is the problem, it offers an alternative to replacing the balancer.
Signs this part may be needed include oil seeping from the timing cover seal area, or a visible groove worn into the balancer hub where the seal rides. Diagnose the source of the leak before replacing parts. Follow the vehicle service information for installation.
Interchange: 66595RS · 66596RS
This part cross-references / interchanges with the following part numbers:
What does the National 88187 sleeve do?
It installs over the worn sealing surface of the harmonic balancer hub and gives the timing cover seal lip a fresh surface to ride on.
Which vehicles does part 88187 fit?
It is listed for 735 applications, including the 1964-1968 Ford Mustang (V8-4.7L) and the 1975-1996 Ford F-150 (L6-4.9L, V8-5.0L). See the Buyer's Guide tab for the full list.
What signs suggest I may need this sleeve?
Oil seeping at the timing cover seal, or a groove worn into the balancer hub where the seal lip rides, may indicate a worn sealing surface. Confirm the leak source before replacing parts.
Should the timing cover seal be replaced at the same time?
This listing covers the 88187 sleeve only. Check the vehicle service information to see whether the timing cover seal should be replaced during the same repair.
What part numbers does 88187 interchange with?
National 88187 cross-references to 66595RS and 66596RS.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
