Rb26dett Cracked Deck

[johnnyt]

Gday guys

Just got my block back from the machinist

its had

torque plate hone

decked

acid dipped

line bored

and i was out doing the ring gaps and noticed two hairline crack from the bolt hole to the water jackets on the exhaust side of the block..

now from what i know the oil feed is all on the intake side of the block and drains to the exhaust side

after a lot of searching ive found this to be a common problem, but only seems to be an issue when its on the intake side, due to oil mixing from the feeds to the water gallery..ive spent a lot on this block in machining and really dont like the idea of doing it again... what do yas think?

also i read something about using the loctite 2 part epoxy to build up the water gallerys?

cheers

JT

[johnnyt]

anything guys?

[NYTSKY]

Tough one mate, might hold might not.

To be safe i would get another block and start again, especially if you are spending alot of time and money on it. Sorry.

[johnnyt]

Yeah im hearin ya.. but im thinking if someone confirms that there is no oil gallerys on the exhaust side of the block, then i'll probably use it.

the cracks are nowhere near the bores, and considering they go from the bolt hole to the water jacket they cant go any further..was more worried about oil seeping into the cooling system.

[STATUS]

new block, cheap anyways. we usually pay 200-300 ish for a bare 26 block from a local wreckers.

Edited August 24, 2009 by URAS

[johnnyt]

new block, cheap anyways. we usually pay 200-300 ish for a bare 26 block from a local wreckers.

Ive got 2 spare blocks.. the problem is i just waited ages and spent a bucket load on machining..

[GTR-32U]

I am surprised with the money spent that a cracktest wasnt performed or magnufluxed..

[Finchy33]

I am surprised with the money spent that a cracktest wasnt performed or magnufluxed..

x2

[GT-RZ]

keep in mind you can see the crack now and it's cold. once a bit of heat gets in there coupled with stress from the head bolts... time for the bin.

I hate to say it because id be frustrated with wasted money but next time make sure you get it crack tested first!!!!! At least you have two spare blocks for backups... better to spend less money now than having problems later down the road and ripping the motor out then..

[STATUS]

Ive got 2 spare blocks.. the problem is i just waited ages and spent a bucket load on machining..

ask your machinist why they machined it without checking it....

[bradsm87]

Yeh that's pretty fuct. U'd think after dipping it they'd check it before they go hardcore with it.

I'd go a new N1 block. They're only about $2.5k and ur getting a brand new block made of a stronger material. U won't need to acid dip or line bore that at least and the machinist should do U a pretty good deal on the rest.