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1 09/97 CB-257

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LB161 LPG / NH3 Compressor This presentation is a simplified description of the disassembly of a Blackmer LB161. The current production model is the LB161B (August 1997). – PowerPoint PPT presentation

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Title: 1 09/97 CB-257

1
LB161 LPG / NH3 Compressor
This presentation is a simplified description of
the disassembly of a Blackmer LB161. The current
production model is the LB161B (August 1997).
The largest difference affecting disassembly is
in the oil pump. The current oil pump is self
reversing and is not shown in this
presentation Select one of the following
Hilites Only
Detailed Text
2
LB161 LPG / NH3 Compressor
3
LB161 LPG / NH3 Compressor

The LB161 compressor is suitable for many
applications, but the most common is the transfer
and vapor recovery of liquefied gases such as
propane, butane, and anhydrous ammonia. The
non-lubricated cylinder design of the LB161
allows the transfer of these products without
contamination of the products and is capable of
transferring up to 90 gallons per minute (340
lpm). Typically the LB161 is driven by a 5 or
7.5 HP driver in the 650 to 800 rpm range.

4
LITERATURE

Be sure you have the proper literature before
starting work on the compressor. Locate the
parts list and Installation, Operation and
Maintenance instructions. In addition, you may
have received additional instruction sheets with
your machine that further describe such items as
valves and packing.
Literature is available on the web at
blackmercompressor.com
or from your Blackmer distributor.

5
Tools

The tools normally required for small machine
service will be adequate. A small strap wrench
is useful as well as a good spanner. The Blackmer
spanner p/n 790316 has 1/4 pins and is used for
piston removal. Blackmer wrench p/n 790535 may
be used for the valve hold down screws. A flat
scraper and inside snap ring pliers are also
needed.
Blackmer offers a complete tool kit which has all
of the hand tools necessary to dismantle the
machine.
On larger machines a small hoist might be needed
for one man to do the job, depending on the
environment. Generally, two men can handle the
disassembly of any Blackmer machine.

6
Nameplate

On the side of every Blackmer compressor is a
nameplate which doubles as an access opening for
inspecting the piston rod.
The nameplate will show the compressors model
number, serial number, ID number, and oil
capacity.
The compressor ID is a coded number that fully
describes the compressors construction.
Make certain that you have these identifying
numbers when you call your Blackmer distributor
for parts or service assistance.

7
LB161 Compressor

Blackmer offers a variety of LPG transfer
compressors.
The LB162 is similar to the LB161 shown in this
presentation but has two seals separated by a
distance piece on each piston rod.
Larger models are
LB361 / LB362 15 bhp (11 kw)
LB601 / LB602 40 bhp (30 kw)
LB942 50 bhp (37 kw)

8
Pressure Gauges

Blackmer compressors are typically fitted with a
pressure gauge on both the suction and discharge.
The gauges are fitted with a pulsation dampener
to eliminate much of the vibration of the gauge
needle making it easier to read and extending the
life of the pressure gauge.
Both suction and discharge pressure gauges should
be installed on every compressor.

9
Valve Caps and Hold Down Screws

Remove the valve caps to access the valves.
After the valve caps have been removed, the
valve hold down screws can be removed with a
spanner wrench (such as a Blackmer p/n 790316 or
790535).
Note the O-ring under each cap these should be
replaced rather than reused. Older models will
have a metal gasket instead of an O-ring under
the valve cap.

10
Valves

With the hold down screws removed, the valve
post, valve and gasket may be taken out.
A liquid relief device in the suction valve post
helps protect the compressor in case liquid
enters the cylinder area. It consists of a ball
and spring relief valve which will allow liquid
to be returned to the suction piping if
necessary.
The discharge valve is held in place by a solid
post.
Make certain the valve gaskets are removed with
each valve as they may be difficult to see in the
head. The valve gaskets are normally aluminum
and must be replaced when the valves are removed.

11
Cylinder Head

To remove the cylinder head, unbolt the two
center head bolts from the top of the head and
the four head bolts from the corners of the head.
The two center head bolts have metal gaskets
which are normally not reusable. After the
cylinder head bolts have been removed, the head
may be lifted from the cylinder.

12
Head O-rings and Piston Nut

The head is sealed to the cylinder with four
O-rings (usually Buna-N). O-rings seal each
cylinder and both center head bolts and are not
normally reusable.
The piston nut is removed with an adjustable
spanner. This spanner has two 1/4 pins which
fit into holes in the top of the piston nut. Note
the nylon locking device on the piston nut.

13
Piston Removal

Once the piston nut has been removed, the spanner
is used to unscrew the piston from the rod.
Under each piston is a thick washer and one, or
more, shims. These shims adjust the height of
the piston in the cylinder. This is referred to
as the deck height. Unless a major part has
been changed, the deck height should not need
adjustment. Changing the piston, crosshead
assembly, cylinder body, main bearings or
crankshaft may require adjustment of the deck
height.
Rotate the crankshaft to bring the other piston
to top-dead-center for removal. Each piston is
fitted with three piston rings. Each ring has a
stainless steel expander between it and the
piston. Install each piston ring with the bevel
on the inside facing up. The ring and expander
gaps should be staggered at 180 intervals during
installation.

14
Cylinder

With the pistons removed, the cylinder can be
unbolted and removed to gain access to the
packing boxes. Two O-rings seal the bottom of the
cylinder.
Notice the passage in the bottom of the cylinder
between the bores. This allows gas to move from
one cylinder to the other as the pistons move up
and down.

15
Packing Box Removal

The packing boxes are secured by a hold down
screw which is removed with the same adjustable
spanner that was used on the piston nut and
piston. Note that the hold down screw also has a
nylon insert that keeps it in place.
The packing boxes may now be lifted off the rod.
O-rings seal the bottom side of the packing boxes.

16
Packing Box disassembly

To remove the seals (packing) from the box
Remove the top snap ring with a pair of inside
snap ring pliers. Depress the spring with a
screwdriver handle to make this operation easier.

17
Rod Seals

With the snap ring removed, the top washer,
spring, middle washer, seal rings, bottom washer
and retainer ring can all be removed.
The seal consists of three types of rings. One
ring is a male ring, next a series of V-rings,
then a female ring.
On LB161 compressors, the spring and male ring
will be at the top and the female ring will be at
the bottom.

18
Piston Rod Inspection

The piston rods and the top on the crossheads are
visible through the opening when the nameplate is
removed.
The crosshead guide is secured to the crankcase
by six bolts.

19
Crankcase and Crosshead

With the crosshead guide removed, the crosshead /
piston rods are visible. The flat gasket on top
of the crankcase may require the use of a flat
scraper to remove completely.
The oil dipstick is located in the access cover.
On current models, it is located adjacent to the
access cover. The oil viscosity and capacity are
found in the Instruction Manual.

20
Crosshead Connecting Rod Removal

Removal of the crankcase access cover and gasket
permits access to the connecting rods. After the
bottom cap of the connecting rod has been
removed, the piston rod / crosshead and the top
half of the connecting rod may be lifted off from
above.

21
Crosshead and Connecting Rod

The connecting rod and crosshead assembly are
separated by removing the wrist pin in a bench
press. Note that the wrist pin has a plastic
retainer plug on each end.
The piston rod is permanently secured to the
crosshead at the factory and no attempt should be
made to separate them. Final machining is done to
the assembled crosshead / rod which precludes
their reassembly once separated. The grooves in
the crosshead are lubrication channels.
The small end of the connecting rod has a bronze
bushing and is lubricated via and internal port
running the length of the connecting rod.

22
Crosshead and Connecting Rod (contd)

A precision insert split shell bearing is located
at the big journal end. Tabs on the bearing
shells fit into slots in the rod and bearing cap.
These retain the shells and align the oil feed
holes.
The LB161 uses a bronze bushing on a steel wrist
pin at the small end of the conrod. The oil
admission hole in the bearing or bushing must
align with the oil supply hole in the connecting
rod small end. When the bronze wrist pin
bushing is replaced, it must be honed to final
dimension after being pressed into the connecting
rod
The rod and cap are matched sets, do not mix.
Match marks must align when assembling bearing
cap to connecting rod.

23
Oil Pressure adjustment, Strainer

The oil pressure adjustment screw includes an
O-ring, lock nut, spring and ball. Turn the
screw inward (clockwise) to increase the oil
pressure setting.
The oil pickup tube with washers, O-ring and
strainer fits in the crankcase under the bearing
carrier. If any foreign material is noticed in
the strainer, its source should be quickly
identified to prevent reoccurrence of the
problem.
The pipe plug next to the oil pickup tube opening
is the crankcase oil drain.
Some units will be fitted with an external oil
filter (not shown).

24
Oil Pump

This photo shows the oil pump used in the LB161.
The LB161B uses a different pump.
Remove the oil pump cover and O-ring to withdraw
the oil pump. Notice the small O-ring on the
pump shaft and the bronze bushing in the bearing
carrier.
The oil pump cover can be installed with either
left or right rotation arrow visible. When
installing the cover, make sure that the arrow at
the TOP of the cover indicates the desired
rotation direction.

25
Bearing Carrier

The photo shows the bearing carrier / oil pump
used in the LB161. The LB161B uses a different
style.
The entire bearing carrier / oil pump assembly,
with gasket, can be removed intact. This allows
the crankshaft to be removed.
Note the slot in the end of the oil pump drive
shaft. This slot must align with the drive tang
in the end of the crankshaft during installation.

26
Crankshaft Removal

Remove the crosshead and connecting rod
assemblies to proceed with the crankshaft
removal. Notice the lubrication holes on the
bearing journals. Also note the spray nozzles on
the crankshaft. The spray nozzles lubricate the
crosshead guide and the main roller bearings.
The top of the crankcase is fitted with a
breather which prevents entry of foreign material
into the crankcase but allows the release of
crankcase pressure.

27
Bearing Cover Plate

The bearing cover plate is on the flywheel side
of the crankcase. Behind this plate are a series
of shims which adjust the preload on the main
bearings. These shims are normally reusable and
the shim thickness will not have to be adjusted
unless the crankshaft and / or main bearings are
replaced. The bearing cover plate also contains
a crankshaft oil seal.

28
End ofPresentation
1809 Century Avenue Grand Rapids, MI, USA
49503 Ph 616-241-1611 Fax 616-241-3752 www.black
mer.com
29
LB161 LPG / NH3 Compressor
30
LB161 LPG / NH3 Compressor