Bigblock

A friend has an 86 pick-up.Who knows what year engine is in it!The 86 timing set does not fit.there are 98 links in the chain.He tries another year model timing set with 96 links in the chain.It dont fit either.It may be a 20R we dont know but would that make any diff?Thanx
Bigblock

86yota321

Are the sprockets for a single chain or double?

Jay351

Sure the motor is that year?

swampfox

if it is one link to short try autozone. i bought a 86 from a guy that was well known for mixing truck parts, i learned after i bought it. if i remember right it was a low compression head on a later model block.

Bigblock

We dont know what year the engine is.How do you tell?I'm helping a friend here and I'm a V6 guy.
Bigblock

86yota321

I believe that the 81 and 82 years had a 98 link double chain setup. (someone correct me if I'm wrong on those years). 83 and 84 changed to single chain/98 links. In 85 that changed to the 96 link single chain. I bought a motor last spring from an "87" and once I dove into replacing the kit, I found out it's actually from 81 or 82 because I have the 98/double chain kit in it. Also round exhaust ports on the head is 84 and older. Pear-shaped are 85 and up. Hope it helps a little.

86yota321

Was the motor missing it's timing components when he bought it?

abecedarian

The head is taller- 3.290" from cam centerline to deck (head gasket surface) and the block is taller- 9.120" from crank centerline to deck (head gasket surface) for 84 and below; whereas on the 85 and up they are 3.130" and 8.930" respectively; barring any milling which would obviously make the distances less than those.

No other combination of head / block should require a longer chain, being 98 links, than the 84, and earlier whether single or dual row chains or 22r, 20r, 18r, or even 21r for that matter.

Are you trying to put the chain on with the tensioner installed?
If so, maybe remove the tensioner, install the chain, then put the tensioner back on.
Or take the chain you have and count the links?
It doesn't have a head gasket shim installed, does it? (shouldn't matter but....)

annoyingrob

You can tell the old/new heads apart by their timing covers, but I can't describe it. The older ones are much more rounded, and had a squarish front, where the newer ones had the front corners angled.

How far off is the chain from fitting? It's a REALLY tight fit when new.

toyotabull

the 81-84 20r and 22r block are taller than the 85 and up lazer block by 2 or 3 mm. the 22r head has a swirl type combustion chamber where as the 20r head has the dome type. are the chains too long or too short? I have a 20r head on a 84 22r block and I know the 85 chain is too short. you might have to take a chain link out of the longer chain, but not something I would recomend

Bigblock

One chain is too short the other is too long!Guides make no diff.

Bigblock

Jay351

So it needs a chain with 97 links?

toyotabull

if your having a hard time with chains it might be an idea to find someone with a 22r head that will trade you or buy another one. now there are 2 22r heads out, one is for the older 22r that has the open combustion chamber for the dish top pistons and the other is the swirl type for the 85 and newer 22re fuel injected with the lazer block and the flat top pistons. just make sure of what you have before sending parts to the machine shop to have them cut down for things to fit, seen it happen, but needed an adjustable cam gear afterwards to make it run good.

misterzee

In a 'normal' replacement, you do have to pull up with a prying tool, like a screwdriver to get the cam gear up onto the camshaft. This overcomes the tensioner, which is pushing into the chain, taking up slack. I have seen pix of tape holding the tensioner compressed during this part. My preference is to have the timing cover in place first, with the cam gear in the chain at the correct spot. Then drop the head into place and torque and finally, install the cam gear up onto the cam, prying it up into place.

tried4x2signN

DEAR LORD!


http://www.lcengineering.com/TechNotes/?techid=49

Cylinder Head Identification
1975 - 1980 20R Cylinder Head
Round Intake Port
Round Exhaust Port
80/81 C.C. Chamber
Intake Valve Diameter 43mm
Exhaust Valve Diameter 35mm

1981 - 1984 22R Cylinder Head
Square Intake Port
Round Exhaust Port
82/83 C.C. Chamber
Intake Valve Diameter 44.5mm
Exhaust Valve Diameter 36.5mm

1985 - 1995 22R-22RE Cylinder Head
Square Intake Port
Pear Shape Exhaust Port
52/54 C.C. Combustion Chamber
82/83 C.C. Chamber (Turbo) Intake Valve Diameter 44.5mm
Exhaust Valve Diameter 36.5mm
Engine Block Identification
1975 - 1980 20R Block
Deck Height 11.280\"
Stock Bore 88.5mm - 3.484\"
Maximum Over Bore 90.0mm - 3.544\"

1981 - 1984 22R Block
Deck Height 11.280\"
Stock Bore 92.0mm - 3.622\"
Maximum Over Bore (Cast Piston) 93.0mm - 3.662\" (+.040\" Over)
Big Bore Forged Piston Kit 94.0mm - 3.701\" (+.080\" Over)

1985 - 1995 22R-22RE \"Laser Block\"
Deck Height 11.090\"
Stock Bore 92.0mm - 3.622\"
Maximum Over Bore (Cast Piston) 93.0mm - 3.6662\" (+.040\")
Big Bore Forged Piston Kit 94.0mm - 3.701\" (+.080\" Over)

All Toyota 20R - 22R - 22RE engines use the same crankshaft and connecting rods. To accommodate the different deck heights, Toyota changed the compression height (piston pin location).

tried4x2signN

1st tell us what block you have. Look up, at the post above this and simply tell us weather or not the block looks the same...

broncrider

are you trying to put the chain on with the gear still on the cam? just a question that came to mind