A re-manufactured long block or rebuild existing engine

Asked by May 23, 2016 at 09:13 PM about the 1991 Jeep Cherokee 4 Dr Laredo 4WD

Question type: Maintenance & Repair

My son owns a 1991 Jeep Cherokee Laredo 4x4 with 4.0 engine and
81,000 miles.  It is very clean and has always been well maintained and
always in the family.  This is why I may be willing to pay more than it may
be worth.
While driving home the water pump seized and it over heated.  We
replaced the water pump and thermostat.  It is still overheating and there
are metal shavings in the oil.  I assume that the head is warped and has
caused internal damage.  I am trying to discern whether to install a re-
manufactured engine or have the existing one rebuilt.  Using the VIN shows
that an original long block is not available.  I have heard some reports that
the re-man  long block (from NAPA) does not come with OEM parts and
there have been some failures.  I found a local shop that builds race
engines and rebuilds engines using OEM parts (depending on the condition
of the core which may need to be replaced).  The re-man from the
dealership comes with a better warranty but the rebuild has a minimal
warranty.  Which would the best way for me to go?

4 Answers

16,685

Rebuild, you will have greater control and know what was done.

My concern with a rebuild is that they don't seem to have much of a warranty compared with a re-man long block.

16,685

Look at it this way, it's like the difference between a custom built computer and one you can buy off the store shelf. The custom built machine has the parts you specified and you actually know the person who built it as opposed to a company that had a lot of different people with their hands in different phases of production. Forget the warranty, it's just a piece of paper. When someone actually hand builds any product, there's a certain pride of workmanship that goes into it.. it's like their signature on the end product. That is why"exchange engines" are never as desirable as a engine that was gone through with a fine tooth comb.

223,745

IMO, for a daily driver, I would put a reman in, a '91 Jeep V6 is not going to be a collectors item to have a matching # engine. Reman engines can be replaced in a full days work, a rebuild can take weeks as garages usually will work on the engines in their spare time. Also consider a used engine with lower miles is your shop can find one. Good Luck.

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