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Page Contents

Short
Engines
Important
Notes - Short Engines

Short Engines
Short engines
are sold on an exchange basis (except certain new short
engines).
The old unit
must be a suitable type (1980 onwards) otherwise a surcharge
will apply.
3.5 Litre - new short engine;
Comprises
new block/crank/bearings/pistons/rods (assembled).Less cam
& followers.

Low Compression (8.13:1) - (1) - ETC7714

High Compression (9.35:1) - (1) - RB7121
3.5 Litre - recon short engine (exchange);
Comprises
recon block, rebored with new pistons/cam bearings/reground
crank & new bearings (assembled).
Less
cam & followers.

Low Compression (8.13:1) - (1) - ETC7714R

High Compression (9.35:1) - (1) - RB7121R
3.9 Litre -
new short engine - (1) - RB7487
Comprises
new block/crank/bearings/pistons/rods (assembled). Less cam
& followers.
3.9 Litre -
recon short engine - (1) - RB7487R
Comprises
recon block, relinered with new pistons/rings/cam bearings/reground
crank & new bearings (assembled).
Less
cam & followers.
3.9 Litre -
uprated short engine - (1) - RB7487UR
Comprises
new, large journal block, cross-bolted & ARP mains studs.
Crank/rods & pocketed pistons. Lightened & balanced
assembly.
Less
cam & followers.
4.2 Litre -
short engine - (1) - ERR4171
Comprises
block/crank/bearings/pistons/rods (assembled). Less cam &
followers.
4.0 Litre - new short engine;
Series 2
Range Rover application.
NB.
Unsuitable for use with pre '95 heads as low compression ratio
results.
Large journal,
cross-bolted type.
Comprises
new block/crank/bearings/pistons/rods (assembled). Less cam
& followers.

Low Compression * (8.13:1) - (1) - STC1890

High Compression * (9.35:1) - (1) -
STC1891
* Please see
note regarding Compression Ratios below.
4.6 Litre - new short engine;
Series 2
Range Rover application.
NB.
Unsuitable for use with pre '95 heads as low compression ratio
results.
Large journal,
cross-bolted type.
Comprises
new block/crank/bearings/pistons/rods (assembled). Less cam
& followers.
When
using this short engine to replace earlier type (3.5 or 3.9)
engines, a crank spacer - part no. STC1893SPACER
- may be required.
Please
enquire for details.
Sump
pan may also require relieving to allow swing clearance for
front web of crank.

Low Compression * (8.13:1) - (1) - STC1892

High Compression * (9.35:1) - (1) -
STC1893
* Please see
note regarding Compression Ratios below.
4.6 Litre - new short engine;
Pre-Series 2
Range Rover applications.
Suitable for
use with pre-Series 2 Range Rover cylinder heads (see notes
regarding compression ratios below).
Large journal,
cross-bolted type.
Comprises
new block/crank/bearings/pistons/rods (assembled). Less cam
& followers.
When
using this short engine to replace earlier type (3.5 or 3.9)
engines, a crank spacer - part no. STC1893SPACER
- may be required.
Please
enquire for details.
Sump
pan may also require relieving to allow swing clearance for
front web of crank.

High Compression * - (1) - STC1893HC
* Please see
note regarding Compression Ratios below.
4.8 Litre -
new short engine - (1) - RB7676
Comprises
large journal, cross-bolted block & long stroke (86mm)
crank. ARP mains studs, new pistons & rings. Less cam
& followers.
When
using this short engine to replace earlier type (3.5 or 3.9)
engines, a crank spacer - part no. STC1893SPACER
- may be required.
Please
enquire for details.
Sump
pan may also require relieving to allow swing clearance for
front web of crank.
5.2 Litre -
new short engine - (1) - RB7682
Comprises
large journal, cross-bolted block, fitted with special 96mm
bore lines long stroke (90mm) cross-drilled crank,
steel
rods & new pistons (90mm stroke).
Lightened
& balanced assembly. Less cam & followers.
When
using this short engine to replace earlier type (3.5 or 3.9)
engines, a crank spacer - part no. STC1893SPACER
- may be required.
Please
enquire for details.
Sump
pan may also require relieving to allow swing clearance for
front web of crank.
Important
Notes - Short Engines
SHORT
ENGINE BUILD-UP
When building
up a short engine to a complete assembly, it is essential to
thoroughly examine every part you intend to reuse. We
recommend that you pay special attention to the camshaft,
followers, pushrods & rocker gear, checking carefully for
signs of wear; reusing worn parts is false economy and you
risk contaminating your new engine with abrasive particles.
The following
parts MUST be meticulously cleaned prior to fitting:
Sump &
oil pick-up pipe
Timing cover
& oil pump assembly
Cylinder
heads
Rocker covers
Failure to
observe these points may lead to engine damage and may
invalidate the engine's warranty.
Short
Engines - Ancillary Components.
If you are
re-fitting ancillary components - water pump, alternator,
distributor, carburettors or fuel injection - check that they
are suitable for re-using. We recommend having carburettors
serviced and fuel injectors cleaned/replaced before re-fitting.
The cooling
system - including the radiator and heater - should be flushed
through with clean water and the hoses checked before re-using.
The correct
ratio (minimum 33%) of antifreeze must be maintained at all
times. Oil coolers should be flushed of old engine oil.
Engine &
gearbox mountings should be checked and renewed as necessary.
The clutch
operating system should be checked for wear.
All
engines - oil pump priming.
All engines
not fitted with crank-driven oil pumps should have their oil
pumps primed before initial start-up. Please consult a
workshop manual for this procedure.
TIMING
COVERS
If the timing
cover you intend to fit to your short engine incorporates a
crank-driven oil pump, please inform the Sales Department at
the time of ordering (3.5 & 3.9 litre Standard Short
Engines only).
Uprated 3.9
litre Short engines, as well as all Short Engines of 4.0
litres and above, are suitable for timing covers which
incorporate crank-driven oil pumps. If fitting the earlier
type of timing cover - with camshaft-driven oil pump - to a
short engine of 4.0 litres or above, please also request crank
spacer, part no. STC1893SPACER,
which will ensure the crankshaft pulley is securely fitted. If
in any doubt, a member of our Sales Department will be pleased
to help you.
COMPRESSION RATIOS - CYLINDER HEADS & SHORT ENGINES
There are
various different Rover V8 cylinder heads available, with
different combustion giving a variety of compression ratios
when fitted to a short engine. Therefore, you will need
combustion chamber size of the cylinder heads that you intend
to use in order to be able to calculate the engine's
compression ratio.
As a general
rule, cylinder heads up to the introduction of Series 2 Range
Rover (1994) have approximately 34-36cc combustion chambers.
From the introduction of Series 2 Range Rover (4.0 & 4.6
litre engines), they have approximately 28cc combustion
chambers (If in doubt, cylinder heads fitted to 4.0 & 4.6
litre engines have only two rows of cylinder head bolts;
earlier engines have three rows).
Refer to the
table below of Short Engine & Cylinder Head Applications
for more detailed information.
This
information does not take into account any machining work done
on the cylinder heads in the past.
In certain
circumstances, it may be cheaper to purchase a pair of
reconditioned cylinder heads than to try to match a pair of
unknown heads to a Short Engine.
Alternatively,
it may be worth considering a Full Engine, which is supplied
complete with fitted cylinder heads.


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