Water To Oil Heat Exchanger On 7afe

[rob83ke70]

I have a 92 model ae93 corolla seca ultima with a 7afe 1.8lt engine. The vehicle appears to be fitted with a water to oil heat exchanger (engine oil cooler), and the oil pickup/return unit is between the oil filter and the block.

 

when the engine was apart, the machine shop lost the union that retains the pickup/return unit and mounts the oil filter. I have ordered a piece from toyota, and it appears to be appropriate for vehicles WITHOUT the heat exchanger fitted. They had two part numbers, one was long since not available, the other was good.

 

does an ae102 or ae112 have this heat exchanger fitted or were they deleted? were they ever deleted on an ae93? were there techlines/technical service bulletins issued on this? was there every any dramas?

 

I'm assuming it won't be a huge headache to not fit the heat exchanger, its just for the fact that it is there and I'd rather be using it. I may have to get a second hand bit or a custom piece made to use it!!

 

Robert.

[19914afc]

why don't you make the machine shop get a new one if they where the ones who lost it?

[LittleRedSpirit]

why don't you make the machine shop get a new one if they where the ones who lost it?

 

 

Its a 2 fold thing, when you startup it heats your oil then when running it maintains the temp of it.

 

Id say run with it and also make the machine shop sort it out.

[rob83ke70]

complicated. I dropped the engine block there, this piece still attached because I didn't have a socket the right size at home to remove it. My brother picked the block up, and I didn't realise it was missing for a little while after..

 

I'm a little less than impressed that when I asked them about it they proceeded to tell me that they wouldn't have removed that piece off the block because all they did was hone the bores and that piece wouldn't have been in the way.....

 

anyway, here's me thinking "I'll just get a new one off toyota, how hard could it be?" so I forked out $12 and bought one, but its for the engine without the heat exchanger.

 

I'd really rather not have a massive blue with the machine shop!! I've been down that path before and having just got out of a bad job with a dodgy boss who seemed to rub everyone up the wrong way I'm kind of eager to make friends in the trade....

 

On closer inspection its a oil to air heat exchanger as well, it is a separate thing from the radiator.

 

Anyway, I've fitted the oil filter without this heat exchanger and hopefully it all works for the time being until I can sort something out! I'll probably end up getting one made I'd say with the way this is going!!

 

Robert.

[rob83ke70]

when you clean a block up in a machine shop you dunk it in a caustic solution? if this is the case does it eat aluminium or welch plugs?

 

I got the block back and the welch plugs were all in it and looked ok so I've assembled the engine, fitted it to the vehicle, and filled the cooling system up to find i've got a nice little piddle of water coming out of one of the welch plugs....

 

new welch plugs tomorrow. should've done that with the engine out of the car!!!

[altezzaclub]

Caustic would eat aluminium only, but welch plugs are usually brass. (or they were back in the days when I was replacing them!)

 

Maybe the hole was being blocked by rubbish/rust/scale before you took it in.

[Hiro Protagonist]

I have a 92 model ae93 corolla seca ultima with a 7afe 1.8lt engine. The vehicle appears to be fitted with a water to oil heat exchanger (engine oil cooler), and the oil pickup/return unit is between the oil filter and the block.

 

when the engine was apart, the machine shop lost the union that retains the pickup/return unit and mounts the oil filter. I have ordered a piece from toyota, and it appears to be appropriate for vehicles WITHOUT the heat exchanger fitted. They had two part numbers, one was long since not available, the other was good.

 

does an ae102 or ae112 have this heat exchanger fitted or were they deleted? were they ever deleted on an ae93? were there techlines/technical service bulletins issued on this? was there every any dramas?

 

I'm assuming it won't be a huge headache to not fit the heat exchanger, its just for the fact that it is there and I'd rather be using it. I may have to get a second hand bit or a custom piece made to use it!!

 

Robert.

 

Got photos of it? The AE102 and 112 7AFE didn't run a water-to-oil (and didn't think the AE9x ones did either), they ran a air-to-oil cooler behind the front bumper.

[rob83ke70]

it is an oil to air heat exchanger behind the front bumper on closer inspection..... no fancy radiator here lol.

 

thats interesting I might go hassle toyota next door during lunch tomorrow and see if I can get that bit for an ae102 or ae112....

 

It does work without the heat exchanger installed, I just put the other union in place and put a filter on it. I would have had it going today but for some drama with the extractors. I disconnected the injectors though and cranked it until it got oil pressure so at least I know it has pressure lol.

 

The welch plug had a bit of pitting on the bottom, possibly electrolysis, other than that it looked pretty good. Maybe it was blocked with some rubbish and it was cleaned off. I will check for stray voltage anyway when it is going!!

 

Robert.

[Evan G]

they dip your block in acid, its only to remove paint and oil.

 

i took my sump to machine joint and asked them if i could throw it it the acid dip and they said its not gonna remove the rust it just removes oil and paint

[rob83ke70]

got the correct part on order - has to come out of japan, eta 20-30 working days!!

 

the part number was NA in australian toyota's parts system but was still good in the global system...

 

and it is the same part for ae102 or ae112 as well...

 

Robert.

[beerhead]

Double check the part number, 5S camry motors run one too and also run the same oil filter, might be worth a look.