02 tacoma wont start after timing chain replacement

if you look on my prev threads im trying to fix timing on my uncle 02 tacoma with 3rz motor.
The motor has new head and gasket and bolts but timing marks werent matched
So i remove the valve cover and timing cover (oil pan,crankshaft pulley
I match the dots on both camshaft gears,match the marks on small timing chain, and last match the marks on actual timing chain
Everything according to manual book and i double check everything and put everything back up
But now the truck wont start,tried to crank it but it kept cranking wont turn over
So far i check fuel coming from the fuel line when i try to crank it so obvious not the fuel problems
Anything else that i need to check?
Thank u

 

Compression. Since it wasn't timed right off the start you may have bent valves. A leak down test will let you know what valves are bent by air escaping from either the exhaust pipe(exhaust valve) or out the intake(intake valve)

 

That makes alot of sense,will try to get compression test tomorrow,my uncle did said that he try to start it when he got the timing wrong and the truck started just idles funny or wasnt right,could it be bent valves?

 

Sure sounds like it.

 

should've pulled the head too when taking out timing cover

 

leakdown will tell you if your valves are fudged.

 

Hope the best on your findings, in your favor may be that every bent valve engine I've heard made a helluva racket when the cam tried to open an already open valve, may spit shims and other things also.

 

Just finished compression test on all 4 cyl and result
1 70psi
2 60psi
3 60psi
4 60psi
And idk why but my plugs full of oil

 

Yeah that's not good. I would do a leak down next. You will need an air compressor and can rent the tool from autozone or advance auto. Your comp numbers should be 150-180 area. Oil on the plugs can be from blow by oil getting passed the rings or leaking from the spark plug tube.

 

I don't know that I trust that gauge....bent valves can't seal at all. Your POSITIVE that the timing is right?

 

First attempt my uncle did the timing without taking off the timing cover just base on camgear mark then he start it and didnt feel right and shut the engine
Second attempt i took timing cover off without removing the head and align both timing chains and double check again,put them together and truck wont start and then did compression test
Any reason you dont trust that gauge?

 

It's not that I don't, I just don't know that I do. I have two compression gauges because 1 of them is prone to false lows. It's trickier to seal against the head. The other I put a taper on the spark plug adapter so it seals better to the taper of the plug hole. And I tighten the adapter to the hose now with pliers.

Bent valves probably wouldn't show any compression but timing off WILL give low numbers. Bent valves WILL fire back through and poor timing MIGHT.

Shooting some air to the cylinders would tell you more so the previous guy is correct about a leak through prob. being next. Usually not needed for a bent valve. Under the valve cover, are the valves acting smooth and tight (except for lash clearance) as you rotate the crank? You would have excessive clearance under any that are bent. Did the head get reworked while off? Mileage high?

It sure may be that valves are bent but I'd want to know for sure before pulling the head back off.

And how about clarifying the oily plugs, In the tube or on the tips?

 

well sounds like you bent all the valves and the oil might be from leaking valve seals because now they are bent or ..... maybe a cracked head.

sorry to say but it sounds pretty buggered to me and at minimum the heads need to be off and checked for damage review

 

Was the #1 piston at Top dead center when you put the chain back on? Sounds like the crankshaft is 180 out. Maybe.

 

you said it was cranking but wont turn over? do you mean it cranks over like its turning but just doesnt fire off or what? or does it seem like its stopping?

 

Upload timing inst. from FSM

 

x2 You can also roll engine over by hand and check valve adjustments. A bent valve will have a bigger lash adjustment. Maybe even gapped open 1/16 to 1/8 of an inch.
Still sounds like cam timing to me. Confirm TDC #1 with a straw down sparkplug hole. If your using crank pulley to find tdc it could be slipped giving you inaccurate position of crank shaft.

 

and I'm not sure about the 3RZ BUT....lots of 'interference' engines aren't 'true interference'. They tend to tangle valves when cams are out of phase more than pistons kissing valve crowns. Piston interference is usually on high compression engines or domed pistons. (Chevy LS or Dodge Neon. examples) This is a dual cam engine? Are you SURE both cams are timed right? Most times cam sprockets are interchangeable from cam to cam and have two sets of marks.


Just read manual: Not applicable but still make sure cams are in phase. This does look tricky about chain marks.

 

Yes i double check everything before i put the chain on,piston #tdc,mark 0 on harmonic balancer pulley,two dots meet one dot on cam gears

 

Thats what i thought.idk if i still need to do leak down test or just go head to remove the head