The Mammoth 18R Diagram Thread - Updated with engine specs

[brett_celicacoupe]

Also I'm searching for some 18R-GUE diagrams to complete this thread.

18R-GEU diagrams here

edit; my mistake, this link has already been posted by chris_rg

[thechuckster]

query: has anyone seen 18R-B diagrams? just asking as there's a guy in brisbane building one of these (a factory twin-carb 18R for those who dont know the code).

[RAd28]

well it seems like i'm bringing this thread back from the dead, but regardless.

i can't view about half the pics since i'm on one of those 56-and-a-bit K internet connections, but i've seen only enough to raise more queries...


image 57, is a diagram for the 18R-GU of what looks like anti polution control stuff, NONE of these parts look familiar to me (none on my engine) but i can't help but think that somewhere here is the answer to my question. on the intake manifold, there's a small stubby pipe that comes from between runner 1and 2, and from 3and 4, on my engine the previous owner has rammed a piece of hose into this hole, then another piece on the the end of that piece, which are then linked together and a few more connections Tee's, and elbows later it finds its way to the other side of the block to a large strange looking thingy under the extractors, i believe this is something to do with the PCV, but i'm not 100% sure, what i wanna know is what is it? what is suppose to be there inplace of the silly rubber hoses?

next question, the distributor for the 18R-GU (image 75) shows that the only parts which appear to limit shaft play are a few o-rings, and a bearing? is that all there is? my distributor is pretty crap atm, need to rebuild it.

and finally, River, i don't suppose you'd happen to have a complete PDF of the images you've attacehd? perhaps even if you could print the thread to PDF would be awesome. just something i can download instead of load from the page...

cheers

[river]

Hi,

and finally, River, i don't suppose you'd happen to have a complete PDF of the images you've attacehd? perhaps even if you could print the thread to PDF would be awesome. just something i can download instead of load from the page...

With the new forums and server space we have I may see if theses drawings and other useful information can be placed on the server for all to access.

seeyuzz
river

[MWP]

... or just a ZIP file of all the above images?

[Elohim]

Anyone got diagram for the 18R-C engine?

Need to fix mine ...!

/Carl

[river]

Hi,

It's been too long since I got back to this thread. The 2T engine thread is abundant with juicy data and it is time to honour the 18R engines.

Some of this may be repeated in other threads, and I apologise for that, and also extend my thanks and appreciation to those that have spent the time to put up this information.

18R Information

Tightening Torque for main parts
Cylinder head => 10 - 12 kg-m (72.3 - 86.8 ft-lb)
Valve rocker support => 1.7 - 2.3 kg-m (12.3 - 16.6 ft-lb)
Manifold => 4.5 - 5 kg-m (32.6 - 36.2 ft-lb)
Camshaft bearing cap => 1.7 - 2.3 kg-m (12.3 - 16.6 ft-lb)
Camshaft timing gear => 1.7 - 2.3 kg-m (12.3 - 16.6 ft-lb)
Camshaft drive gear => 8 - 10 kg-m (57.7 - 72.3 ft-lb)
Crankshaft bearing cap => 9.5 - 11.5 kg-m (68.7 - 83.2 ft-lb)
Connecting rod cap => 5.4 - 6.6 kg-m (39.1 - 47.7 ft-lb)
Oil pan => 0.4 - 0.8 kg-m (2.9 - 5.8 ft-lb)
Crankshaft pully => 12 - 15 kg-m (86.8 - 108.5 ft-lb)
Flywheel => 8 - 9 kg-m (57.7 - 65.1 ft-lb)
Pump shaft sprocket => 8 - 10 kg-m (57.7 - 72.3 ft-lb)
Pump shaft thrust plate => 1.5 - 2.1 kg-m (10.8 - 15.2 ft-lb)

Engine Tune Up Guide
Fan belt tension at 10kg load (between fan and alternator) new => 5 - 6mm
Fan belt tension at 10kg load (between fan and alternator) used => 7 - 8mm
Air Con Compressor to crankshaft tension at 10kg load => 15 - 18mm

Battery specific gravity @ 20deg Cels => 1.25 - 1.27

Engine dry oil refill (with filter) => 5.4litres
Engine drain & refill (with filter) => 5litres
Engine drain & refill (without filter) => 4.4litres

Coolant capacity (with heater) => 9.6litres

Spark plug heat range ND => W16EX-U, W16EXR-U
Spark plug heat range NGK => BP5EA-L, BPR5EA-L
Spark plug gap => 0.8mm

Distributor dwell angle => 50 - 54deg
Distributor heel gap => 0.4 - 0.5mm
Distributor damping spring gap => 0.1 - 0.4mm

Ignition timing => 7deg BTDC & 650rpm

Firing order => 1-3-4-2

Intake valve clearance (hot) => 0.2mm
Exhaust valve clearance (hot) => 0.36mm

Idle speed (Man & auto transmission) => 750 +/- 50rpm

Manifold vaccum at idle speed (manual transmission) => More than 420mm Hg
Manifold vaccum at idle speed (auto transmission) => More than 350mm Hg

CO concentration => 1 - 3%

Fast idle speed => 2600 +/- 200rpm

Compression pressure at 250rpm STD => 163psi
Compression pressure at 250rpm limit => 127.8psi
Difference in pressure between cylinders => Less than 14.2psi

Cylinder Head
Surface warpage limit => 0.05mm
Maximum reface limit => 0.2mm
Valve contact surface angle => 45deg
Valve contact width => 1.2 - 1.6mm
Valve refacing angle => 30deg 45deg 60deg

Valve Guide Bushing
Inner diameter => 8.01 - 8.03mm
Outer diameter STD => 14.023 - 14.041mm
projection from cylinder head => 15.8 - 16.2mm

Valve
Intake valve overall length STD => 113.2mm
Intake valve overall length limit => 112.7mm
Exhaust valve overall length STD => 113.7mm
Exhaust valve overall length limit => 113.2mm
Valve head contacting face angle => 45.5deg
Intake valve stem diameter => 7.970 - 7.985mm
Exhaust valve stem diameter => 7.960 - 7.975mm
Intake valve oil stem clearance STD => 0.025 - 0.60mm
Intake valve oil stem clearance limit => 0.08mm
Exhaust valve oil stem clearance STD => 0.035 - 0.70mm
Exhaust valve oil stem clearance limit => 0.10mm
Valve head thickness limit (intake & exhaust) => 0.6mm

Valve Spring
Inner free length => 44.1mm
Outer free length => 46.5mm
Inner installed length => 36.8mm
Outer installed length => 40.8mm
Inner installed tension STD => 7.6kg
Inner installed tension limit => 6.8kg
Outer installed tension STD => 26.3kg
Outer installed tension limit => 23.9kg
Inner squareness limit => 1.6mm
Outer squareness limit => 1.6mm

Camshaft
Bend limit => 0.10mm
Thrust clearance STD => 0.042 - 0.167mm
Thrust clearance limit => 0.25mm
Journal oil clearnace STD => 0.012 - 0.052mm
Journal oil clearance limit => 0.1mm
Journal diameter => 34.972 - 34.996mm
Bearing U/S type => 0.125, 0.25
Intake cam height STD => 44.04mm
Intake cam height limit => 43.7mm
Exhaust cam height STD => 44.14mm
Exhaust cam height limit => 43.8mm

Valve Rocker Arm and Shaft
Oil clearance STD => 0.020 - 0.041mm
Oil clearance limit => 0.08mm

Manifold
Surface warpage limit => 0.1mm

Timing Chain
No1 chain elongation limit at 5kg load => 291.4mm
No2 chain elongation limit at 5kg load => 147mm (17 links)

Timing Gear
Crankshaft gear wear limit => 60mm
Pump drive shaft gear wear limit => 114.5mm
Camshaft drive gear wear limit => 78.2mm
Camshaft timing gear wear limit => 78.2mm

Chain Tensioner and Vibration Damper
No1 tensioner wear limit => 11.5mm
No1 damper wear limit => 5mm
No2 damper wear limit => 5.7mm
Tensioner slipper => 6.8mm

Pump Drive Shaft and Bearing
Thrust clearance STD => 0.06 - 0.13mm
Thrust clearance limit => 0.3mm
Journal diameter front => 45.951 - 45.975mm
Journal diameter rear => 40.959 - 40.975mm
Oil clearnace STD => 0.025 - 0.066mm
Oil clearance limit => 0.08mm
Bearing fitting tolerance => 0.02 - 0.06mm

Cylinder Block
Warpage limit => 0.05mm
Cylinder bore STD => 88.5 - 88.55mm
Clylinder bore wear limit => 0.2mm
Difference of bore limit between cylinders => 0.05mm
Taper and out-of-round => 0.02mm

Crankshaft
to be completed

Piston and Piston Ring
Piston outer diameter STD => 88.44 - 88.49mm
Piston outer diameter oversize => 0.50, 0.75, 1.00mm
Clylinder to piston clearance => 0.05 - 0.07mm
Piston ring installing temperature => 100deg Cels
Piston ring end gap (compression ring No 1) => 0.10 - 0.28mm
Piston ring end gap (compression ring No 2) => 0.10 - 0.28mm
Oil ring gap => 0.2 - 0.5mm
Piston ring to ring groove (compression ring No 1) => 0.02 - 0.06mm
Piston ring to ring groove (compression ring No 2) => 0.02 - 0.06mm

Connecting Rod and Bearing
Big end thrust clearnace STD => 0.21 - 0.34mm
Big end thrust clearance limit => 0.4mm
Bearing oil clearance STD => 0.024 - 0.048mm
Bearing oil clearance limit => 0.08mm
Bearing U/S => 0.05, 0.25, 0.50, 0.75, 1.00
Bushing oil clearance STD => 0.005 - 0.014mm
Bushing oil clearance limit => 0.02mm

Flywheel
Run-out limit => 0.3mm

Oil Pump
Tip clearance STD => 0.10 - 0.15mm
Tip clearance limit => 0.20mm
Side clearance STD => 0.03 - 0.07mm
Side clearance limit => 0.15mm
Body clearance STD => 0.10 - 0.16mm
Body clearance limit => 0.20mm

Water Pump
Bearing fitting temperature => 100 Deg Cels

Radiator Fan Fluid Coupling
Silicon oil viscosity => 3000cst
Capacity => 25cc, but 35cc with temp controlled coupling

Thermostat
Valve start opening => 82deg Cels
Valve openign travel => 8mm (18R-C)
Indentification mark => 82 punch marl or blue painting mark

Radiator
Relief valve opening pressure STD => 0.9kg-cm (12.8psi)
Relief valve opening pressure limit => 0.6kg-cm (8.5psi)

Carburetor
to be completed

Starting System
to be completed

Ignition System
to be completed

Ignition Coil
Primary coil resistance => 1.2 - 1.5 ohm
Secondary coil resistance => 10.2k - 13.8k ohm
External resistor resistance => 1.3 - 1.7 ohm
Insulation resistance @ 500V => Over 10M ohm

High Tension Cord
End to end resistance => Less than 25K ohm

Spark Plug
to be completed

Charging System
Maximum output ampere => 40A
Rotor coil resistance => 4.1 - 4.3 ohm
Brush length STD => 12.5mm
Brush length ST (with IC regulator) => 16.5mm
Brush length limit => 5.5mm

Alternator Regulator
Regulating voltage => 13.8 - 14.8V

That's the 18R stuff, and I'll put down all the same sort of info for the 18R-G. Sorry about the "to be completed" bits. I put in the heading as place markers for the info I can put in.

I will fill them in, but it takes time to get the info and put it into the thread without getting RSI. So, over the next few days I will populate it.

seeyuzz
river

[73GTV]

Blowing dust off of Old Post, This was a great read and thank you for posting this. It came up under a goggle search for a RA40 Engine PDf. Very nice indeed.