TOP END REBUILD!

[iamkierram]

Okay so my Glanza went in for a smoke test today, as it was making a leaky tapping sound, and it turns out there's a crack on the fourth cylinder head and they have advised a top end rebuild and to definitely replace the exhaust manifold as it has seen better days (they don't do the work, it is just a diagnostics place, so I trust that they aren't trying to get money out of me). I'm just wondering how I go about it really, I know I will need a replacement cylinder head, head gasket set, new exhaust manifold, stem seals, cambelt. Am I missing anything? Or is there anything you would recommend getting done while this is being done? Might as well do the whole thing properly despite the cost!

[iamkierram]

Also, does anyone know of anyone who might have a cylinder head (crack free obv) for sale?

[SpikeyJp_68]

Regrind the valve seats and check the stems are straight. Could also replace valve springs depending on how worn they are although i wouldnt bother with springs its not quite that precise of an engine

[gorganl2000]

i'd say if you know someone that is reputable, then just try to get a second hand head in good shape (probably replace valve stem seals--OEM and re-seat valves for piece of mind) and put it on

another option is to take off the head and get the area welded back properly IF its the stud area---i've seen this done in the past...and use back your existing head

they are known to crack around the top stud on the 4th cylinder holding the exhaust manifold...especially if torqued incorrectly

PS if you do any kind of head rebuild...please use OEM parts (valve stem seals, head gasket, exhaust gasket, etc) they will cost a bit more than generic stuff, but should last longer

Edited October 6, 2017 by gorganl2000

[iamkierram]

That is exactly where it has cracked, I'm pretty sure! The diagnostic report reads:

'problem lies within cylinder head on number four cylinder where exhaust manifold face meets'

Is that the same place? 

[gorganl2000]

sounds that way

[lukEp]

Bet it's down to the manifold face being warped. What manifold is it?

[iamkierram]

Well the exhaust manifold is really badly corroded, it’s getting changed out for a Toyosports one tomorrow. I think it’s just the original one that’s in there at the moment. 

[lukEp]

Toyosports one can as well come new very warped, have it checked out by an engineering shop first or you might end up having the same problem. 

[5T4R7ET N/A]

Check the manifold with a straight edge and use two manifold gaskets with the toyosport.

you do get a ticking noise that rises with rpm if there is a leak

[iamkierram]

I already have that sound, not sure if it’s the very thin crack in the fourth cylinder head stud or the corroded manifold..?

[Gainzy]

It's hard to say without pics..