Prepping for head gaskets

So I’ve had a small amount of coolant getting into my oil that I’ve known about for a while and I’m finally going to start collecting the parts I need to do the head gaskets. This is what I’ve order so far

Toyota oem full gasket kit from Yotashop
Aisin water pump
Aisin thermostat
gates rad cap and hoses
URD exhaust cam gears

So my questions at this point are

Whats the recommended brand for head bolts? Oem is like $13 per bolt but I assume there’s a cheaper option that’s still ok

Which timing components should I replace? I’ve read conflicting opinions on wether it’s worth it or not to replace timing chain components

I appreciate any insight folks might have

 

The chains 100% stretch, its worth while to replace them. I wouldn't re-use a set on any 1GR.

At the very least, all 3 tensioners, and the idler gear. Never re-use an old timing chain tensioner. The idler gears are known for failing, they usually have loads of slop.

When/if you get the heads machined, ask for them to be conservative, there's been reports of timing issues due to heads being milled and shortening the distance of the chain.

While the heads are off, I would put diluted dish soap in the rad/heater core and flush it out as many times as possible. Typically its still not enough and you'll spot oil in the coolant down the road, depending on how bad it is.

Lastly, before starting, see if the oil control valves are seized, if they are try to loosen them and let penetrating fluid soak over a few days of driving to see if you can loosen them up.


This thread has a member with limited experience take it on and they came out roses.

https://www.tacomaworld.com/threads/4-0l-v6-with-bad-head-gasket-repair-or-replace.781269/

 

IIRC there is a knock sensor you can only get to if you take off the heads. Go ahead and replace it while you are in there.

 

If you do, it’s critical to torque them correctly.
15 ft/lbs for the 1GR.

 

Thanks this is really good info! I was hoping for a different answer honestly since the timing components seem to be pretty dang expensive. But you’re right that I might as well do it while I’m in there.

 

He is a Toyota Tech, so he should know.
If he says it should be done, it should be done

 

I still say reuse head-bolts

 

I believe you can IIRC.
I think there is even a spec on them.
You measure them or something……

I personally like to use new one.
Mostly because it makes me feel better.

 

Yes if they are in spec Toyota says you can re-use them.

 

Lots of good information and suggestions here. When I did my head gaskets, I didn't change any timing components. However, I would follow Bishop84's advice. Lord knows he helped me many times throughout my repair. FYI, the FSM does provide information on how to measure the timing components for wear but you will need some tools to do so.

Several mechanics, including the FSM, have stated that you can reuse the head bolts. I measured mine per the FSM and they were all in spec, albeit, on the far end of the range. I chose to replace mine but went with Felpro instead.

Take your time, label everything and take a lot of pictures. This effort will serve you well during reassembly.

 

@Quinnbob , good for you for taking this on .

Lotsa good advice to be had here.

You might want to start your own project thread with copious amount of pics. It’ll help you keep track as well as provide details should things go sideways and you need assistance.

Good Luck

 

I really appreciate all the responses, this definitely helped. I went ahead and ordered some felpro head bolts and I’m still shopping around for timing parts.

I did think of another question though:

Does anyone have an opinion on using the Toyota branded FIPG stuff versus regular rtv? I ordered some permatex ultra black but i could get the FIPG if it makes a difference.

 

This is one of those things were I decided to just use what Toyota recommended, their FIPG 103. However, Toyota does recommend a second type of sealer for the water pump part. I chose to reuse FIPG 103 for that as well after talking with several mechanics who work on Toyotas. I can't really comment about how good the Permatex stuff would be. I'm sure others will have an opinion.

 

If they OCV solenoid was sticking it would throw a code wouldn't it?

 

the physical body of the valve seizes in the port so it can’t be removed during repairs. The bracket it uses actually blocks the timing cover from being removed.

 

ahhhhh got ya