4af headgasket - Toyota Nation Forum : Toyota Car and Truck Forums

freakinbox · 10-09-2006, 11:42 AM

Just wondering on the aprox. cost, torque spec on the head bolts. And what else I HAVE to replace at the same time if I do it.

I assume whats what it is since I am losing oil like mad, looks like from the front of the block. The head is clean and my antifreeze is down.

Flashmn · 10-09-2006, 12:56 PM

headgasket is probably around 20bucks. As for bolts, dunno never replaced them, they arent stretching bolts.
Tightening sequence, from center outward, in three steps:
1: 20Nm
2: 40Nm
3. 60Nm

freakinbox · 10-09-2006, 12:59 PM

Don't need to replace anything else? 20??? from where! lol

Flashmn · 10-09-2006, 01:08 PM

somewhere else than the dealership

emiliorescigno · 10-09-2006, 02:20 PM

Welcome to the BHG (blown head gasket) world of pain!!!!! Both of my 4A-FE powered rollas bit the dust because of BHGs, and now I have a MKIII Supra, and we know how that goes....

freakinbox · 10-09-2006, 02:25 PM

well I checked the oil cap and no white crap. But it's in the anti freze. It happened to my 90 jetta. Where instead of the anti freze getting into the oil the oil got into the antifreze, which I didn't think would happen with the 4af.

punter · 10-09-2006, 03:43 PM

What else do you need to replace?

You'd need to find out why it blew and fix that. And check the head is still square.

94_Rolla_Guy · 10-09-2006, 03:48 PM

just the head gasket and the head bolts NEED to be changed, things you can change are valve stem seals (since the heads off) water pump, timing belt, cam seal, crank seal, valve cover gasket.

Flashmn · 10-09-2006, 03:53 PM

Quote:

just the head gasket and the head bolts NEED to be changed

Wrong, the bolts dont need to be replaced, because they arent torque to yield bolts, they dont stretch. Just keep them in the right order and you'll be fine.

freakinbox · 10-09-2006, 04:26 PM

yea I would love to change all that but since I am broke the money for the headgasket will be trouble enough :p

I think the issue is with cylinders 1 and 2.

here's some pics

Sparkplug 1

Sparkplug 2

Sparkplug 3

Sparkplug 4

Where the oil is

This is the waterpump right? Looks like oil on it too

Lastly.... here is the Rad. The oil fill cap and dipstick look clean of the white stuff as I said. Rad wasn't so lucky

And lastly on engine stuff, looks like I have a fuel leak at the pump

Flashmn · 10-09-2006, 05:04 PM

Plugs look ok, besides looking at plugs doesnt tell you anything.

toyotaspeed90 · 10-09-2006, 05:23 PM

unless toyota put them on the 4ag's and not the 4afe's.... they are stretch bolts.... there have been many ae86 & mr2 owners to snap the bolts..... i personally haven't bought new bolts.... i buy new engines

i wouldn't reccommend a $20 head gasket.... it could be a lot of work for someone who isn't used to getting deep into cars.... go with a toyota gasket or an aftermarket (of your choice) 4age gasket... (yes they are the same)... if you want a thinner toyota gasket, get one for a 7afe

freakinbox · 10-09-2006, 05:30 PM

yea I figured the 4age and 4af head gaskets would be interchangable since it still has to go through the same passages in the block.

Suposidly my dad says the red on the #1 and 2 plugs is from the anti freze. The other pics are mostly from around the front of the block just under the head. Makes sense to me since the other 2 don't have it.

toyotaspeed90 · 10-09-2006, 05:37 PM

well.... obviously you don't seem really concerned about this... so i'm gonna assume it still runs...

if you do have a break in the gasket from the combustion chamber to the coolant.... generally you will have a lot of white smoke while running..... this is what happened to me on my old 4afe in the ae92 (before i swapped it)... but it would only smoke every-so often....

a simple test at most shops can be done to see if exhaust gasses are entering the coolant....

but if you have oil in the coolant... i would think that there's no breaks in the combustion chamber (unless the HG went in multiple places)

Flashmn · 10-09-2006, 05:39 PM

Quote:

i wouldn't reccommend a $20 head gasket

Not when you get an OEM gasket for 20bucks.

Quote:

unless toyota put them on the 4ag's and not the 4afe's.... they are stretch bolts

Correct, you know what the tattletale sign of that is? 4A-GE has the 2nd and 3rd phase of the tightening process in degrees, not in NM. Thats a general key for determining if you have TTY bolts or regular non stretch bolts (applies most of the time, not 100% though)

Anyhow I gotta get some sleep, I got a class to teach in the morning.