Pioneer Automotive Industries HB-1121 harmonic balancer repair sleeve for the 1987-1990 Jeep Wrangler 4.2L and other vehicles is a sleeve that fits over a worn sealing surface on the balancer hub. The crankshaft seal then rides on the sleeve.
A groove worn into the hub where the seal rides, or oil showing at the front of the engine, can point to a worn seal surface. These signs alone do not prove the sleeve is the fix, because a leaking front crankshaft seal is another common source.
The vehicles it fits include the 1974-1983 Jeep Cherokee 4.2L and the 1980-1988 American Motors Eagle 4.2L, along with many other Jeep and American Motors models.
One harmonic balancer repair sleeve, which is the number each vehicle takes.
Will the Pioneer Automotive Industries HB-1121 fit a 1987-1990 Jeep Wrangler 4.2L?
Yes, HB-1121 fits the 1987-1990 Jeep Wrangler with the L6-4.2L engine. If your car is a different Jeep or American Motors model, look up its year, model and engine in the Buyer's Guide tab.
Which engines does the HB-1121 repair sleeve cover?
This sleeve is listed for the L6-3.2L, L6-3.3L, L6-3.8L and L6-4.2L engines. Match your engine code to one of these before ordering.
How many Pioneer Automotive Industries HB-1121 sleeves does my engine need?
Each vehicle takes one, and this HB-1121 listing is one sleeve.
How can I tell if the seal surface on my balancer hub is worn?
With the engine off and cool, look for a groove worn into the hub where the seal rides, or oil residue around the front of the engine. A shop can confirm where a leak is coming from.
Can I keep driving with oil seeping at the harmonic balancer?
Have it checked promptly. A shop can tell whether the seal, the hub surface or something else is the source, and whether this engine harmonic balancer repair sleeve is needed.
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.
