Cylinder Head-Disassembly; Cylinder Head-Cleaning And Inspection - Jeep cherokee 1989 Owner's Manual

2D-8
6 Before beginning the disassembly and overhaul procedures, make
sure the following items are available. Also, refer to Engine overhaul
reassembly sequence for a list of tools and materials needed for engine
reassembly.
Common hand tools
Small cardboard boxes or plastic bags for storing parts
Gasket scraper
Ridge reamer
Vibration damper puller
Micrometers
Telescoping gauges
Dial indicator set
Valve spring compressor
Cylinder surfacing hone
Piston ring groove cleaning tool
Electric drill motor
Tap and die set
Wire brushes
Oil gallery brushes
Cleaning solvent
8 Cylinder head -
disassembly
Refer to illustrations 8.2, 8 . 3 and 8 . 4
Note: New and rebuilt cylinder heads are commonly available for most
engines a t dealerships and auto parts stores. Due to the fact that some
8.2 A small plastic bag, w i t h an appropriate label, can be
used t o store the valve train components so they can be
kept together and reinstalled in t h e correct guide
8.3
Use a valve spring compressor t o compress t h e
spring, then remove t h e keepers from the valve stem
The Motor Manual Guy
Chapter 2 Part D General engine overhaul procedures
specialized tools are necessary for the disassembly and inspection pro-
-
cedures, and replacement parts may n o t b e readily available, i t may
be more practical and economical for the home mechanic t o purchase
replacement headls) rather than taking the time to disassemble, inspect
and recondition the originalk).
1
Cylinder head disassembly involves removal of the intake and ex-
haust valves and related components. If they're still in place, remove
t h e rocker arm bolts or nuts, pivot and rocker arms from the cylinder
head studs. Label the parts or store them separately so they can be
reinstalled in their original locations.
2 Before the valves are removed, arrange t o label and store them,
along w i t h their related components, so they can be kept separate and
reinstalled in the same valve guides they were removed from (see illus-
tration).
3
Compress the springs on the first valve w i t h a spring compressor
and remove the keepers (see illustration). Carefully release the valve
spring compressor and remove the retainer, the spring and the spring
seat (if used).
4 Pull the valve out of the head, then remove the oil seal from the
guide. If t h e valve binds in the guide (won't pull through), push
into the head and deburr the area around the keeper groove w i t h a fine
file or whetstone (see illustration).
5 Repeat the procedure for the remaining valves. Remember t o keep
all t h e parts for each valve together so they can be reinstalled In the
same locations.
6
Once the valves and related components have been removed and
stored in an organized manner, the head should be thoroughly cleaned
and inspected. If a complete engine overhaul is being done, finish the
engine disassembly procedures before beginning the cylinder head
cleaning and inspection process.
-
9 Cylinder head cleaning and inspection
Refer to illustrations 9.12, 9 . 14, 9 . i5a, 9.15b, 9.16, 9.17, 9 . 1 8
and 9 . 1 9
1
Thorough cleaning of the cylinder head(s) and related valve train
components, followed by a detailed inspection, will enable you t o
decide how much valve service work must be done during the engine
overhaul. Note: If the engine was severely overheated, the cylinder
head is probably warped (see Step 12).
Cleaning
2 Scrape all traces of old gasket material and sealing compound off
the head gasket, intake manifold and exhaust manifold sealing surfaces.
Be very careful not t o gouge the cylinder head. Special gasket removal
solvents that soften gaskets and make removal much easier are
available at auto parts stores.
3
Remove all built u p scale from the coolant passages.
4 Run a stiff wire brush through the various holes t o remove deposits
8.4
If t h e valve w o n ' t pull through t h e guide, deburr t h e
edge of t h e stem end and the area around t h e t o p of t h e
keeper groove w i t h a file
back
it
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