toyotablue

I replaced timing chain on 86 22RE 4-runner. I turned over & I have no compression. Before I put it back together I checked TDC. On my Crank, the dot (line-up point) was pointed down & on my Cam the dot was pointed strait up. The lifters were both closed at that point. However, when I crank engine I get no compression. I don't want to assume the worst (bent valve(s)). So, I'm wondering if it is possible that I have my cam 180º off?

Is it possible for me to take my cam gear off then turn it 180º then put back on & have compression assuming the valves are not bent?

Thanks for your help on this one.

Dan

My99

I did'nt think the 22RE was an interference engine. Am I wrong?

toyotablue

22RE is an interference type engine.

Is it possible to rotate the Cam gear 180º without taking off the timing chain cover?

More importantly, with the cam being 180º off, can this cause there to be no compression on all 4 cylinders?

Thanks,

Dan

pickupgirl

i replaced my timing chain also and screwed up having it majorly retarded because i set the timing with the vacumm advance still in place


*note* had to edit cuz my post made no sense

cubuff4runner

I was just curious, I used to have the same engine, but I didn't replace the timing chain because to cover went underneath the head gasket. How did you make sure that you did't harm the gasket?

Jeff

My99

Wow. News to me. Are the 3rd Gen V6's interference motors? Do they use chains or belts?

data

I believe 3rd gens use a belt.....

cubuff4runner

3rd Gens have a belt. The 22RE was on my 88 Runner.

My99

Anyone have any idea what the recommended service is on the 3rd gen V's? Are they interference? How many miles do people reasonably usually get before replacing the belts. That sucks, I hate belts!!

CTB

The 3.0L and 3.4L are non-interference engines.

Duffdog

i just replaced my cam on my 88 22re-- are you sure that you didnt rotate the engine away from top dead center and create a disturbed engine. when i put the cam in, the dot was straight up on the cam gear (TDC)-- when you say you have no compression, did you put the spark plugs back in?

T

joez

well, you can do two things. pull the valve cover or pull the oil pan. cause i bet the chain fell off the bottom gear. even with the cam 180 out, it will have compression, and it will run, kindof.

My99

WoOHOOO! (You have to understand, I owned a DSM, breaking timing belts and bending valves on those seem to occur as often as flat tires)

Sorry to threadjack, i'll shut up now.

butnut

That would be my guess too...I know...it sucks. Good luck.

toyota parts dude

iTrader: (2)

i've noticed from ripping apart my trucks that the 85-95 22re's have a rubber bushing in the crank pulley. like a harmonic balancer on a ford 302. the 84 and older 22r's don't have this. a couple i took off the pulleys spun on the center throwing off the timing mark off. if you pull the crack pulley off the timing mark should line up with the keyway on the crank. the one was a 1/4 revolution off. so if this happens when you set the timing marks rite the piston is not at top dead center. so when you check compression if this is the problem when the piston is at top dead center your valves will be open. hopfully this is the problem it will be cheap to fix. hope this helps.

toyotablue

Well, I did it. I tied off the chain to the sides of the engine & pulled the camshaft gear off. I turned the cam 180º & then put the gear back on. I cranked over & still no compression.

I put the crank at TDC & checked the piston to ensure it was at TDC & it was, I turned the engine over too & went progressively through exaugst valve open/close intake valve open/close on compression stroke & the cam appears to be TDC assumming....

Is the cam on TDC when the intake valve is closing on the upward stroke of the piston on TDC?

My understanding is that TDC happens on the combustion stroke. Is this correct?

Nam

Blue,

Yep, TDC happens when the combustion takes place, if there is advancing (5-10 degree), that's the offset when the combustion takes place.

Good luck,

Nam

Nam

My99,

What is DSM? sorry! so what you meant is that the valves will bend if the timing bell break on the 3.o and 3.4 engines?

What interval (mileage) do you recommend on the 3.4L engine to change the timing belt?

Thanks,

Nam

motrhedx81

most timing belts have a service life of about 60,000 t0 80,000 miles. I used to work in a garage and thats what I've always been told. don't know specifics about the 3.0/3.4

My99

DSM = Diamond Star Motors -- A joint venture between Chrysler and Mitsubishi back in the early 90's. Any eclipse/talon/laser turbo car that was built from 1990-1999 is referrred to as a DSM. When the timing belt breaks on those (and you CANNOT get them over the service limit of 60k without them breaking) the pistons meet the valves in a rather brute-force kind of way. This isn't good and is all to common on those cars.

Luckily however, that doesn't happen someone told me on the 3.0's and 3.4's, as they are NON-interference engines, meaning when the timing belt snaps, things that aren't supposed to make contact will not make contact. So if you timing belt brakes on the 3.4 or 3.0, the only problem is your stranded. I'll gamble on a $50 dollar tow bill, but not on a $3,000 engine.