Running a little hot - Oil Cooler replacement?

[Wonko The Sane]

My bike's running a little hotter than usual lately, I had thought it due to summer weather but now the weather has got cooler the bike's still throwing out more heat than I recall being normal earlier in the year.

Earlier this year I changed the oil cooler for one that didn't leak, it was a bit tatty and surface corrosion and now I'm wondering if I should be looking at replacing it.

Cornwall Kawasaki want £400 for the cooler on it's own, and it's probably a good idea to fit new hoses to it to do the job properly.

I've had a good look round the web and I've not been able to find anywhere making a pattern part for the ZZR600E (which surprises me) and all the ones on e-bay look just as bad as mine, if not worse.

I still have the old one I took off, anyone any ideas where to find a cooler / get one made around Manchester?
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[Itchy]

Have you checked your radiator fluid levels?

My CBR ran hot when it was only half filled.

Second an oil cooler isn't exactly a complex bit of kit, the only important bit is the collar which fits onto the engine and is plumbed in.

My old CBR had a 918 fireblade radiator on it. It worked fine.
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[Kickstart]

Hi

Would expect the radiator to make massively more difference to overall engine temp. The oil cooler would probably only make a noticeable difference if the normal cooling system was very marginal.

I would flush the radiator through thoroughly, and when you refill it check the coolant mix.

All the best

Keith
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[orac]

so this just goes of what you think with no temperature information to make an informed decision on what the actual situation is.

give it a coolant change (don't forget to bleed the air out of the system), maybe a flush while you are there, an oil and filter change.

most motors will run over 100*C, most fan cut in at 110, its cutting in often then there maybe an issue somewhere. however with that said, unless the thermostat is in/against the coolant the fan will never cut in (ie if there is no coolant the fan wont come on)
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[RhynoCZ]

Any possibility of air in the system? = Air is a insulator, so the fluid can't transfer enough heat.

OR, there is a pressure leak, and since you did not see anything wet, I'd say the filler cap might be leaking. The cooling system is pressurized = the water can get above 100°C with no problem yet not being boiling.

Extra cooling power is not the way to go. If you get too much cooling power the engine won't never work well, at its operating temperature, which will cause reduction of its life time.
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[Wonko The Sane]

I'm basing things on my feet getting a bit hotter than usual of late
The oil cooler that's on doesn't leak but doesn't look great so I'm assuming it's not doing its job quite as well as it should so aiming to fit a like for like replacement, not a larger cooler

The cooling system is topped up but I've not checked for air etc but I've not had any reason to worry about it
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[Vincent]

If there is a problem, I doubt it's the oil cooler at fault. They usualy get a bit skuzzy just because they have to be in the air flow so get covered in crud but, while some may leak at the connections, there's not much else to go wrong and the dirtiest ones can still look like new inside. Maybe you should test your thermostat and, as above, make sure the cooling system isn't getting "furred up".
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[_Iain_]

Doubt the oil cooler is the fault, however I'd be getting something like this and adapting it to fit.

https://www.ebay.co.uk/itm/13-ROW-AN10-UNIVERSAL-ENGINE-TRANSMISSION-OIL-COOLER-british-FILTER-KIT-BLACK-/151392103739?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item233fac2d3b
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[Itchy]

Could it be that schools have started and the roads are more clogged up?

Around July August riding into Manchester city centre took 15 minutes.

Engine temp from this was around 78-92.

it now takes 20 minutes a barely recognisable amount of time but it involves a lot more high revs low gear filtering.

Engine temp now hovers around 95-103.
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[chris-red]

I flushed a mates ZZR6 through and the amount of sludge that came out was unreal.

I can't exactly remember what I disconnected but basically I inserted a hose into one end of the cooling system and unpluged another then ran the bike this quickly fired out all the muck from the rad. Then I sealed it up filled it and ran it again with the bleed screw open (on top of the rad?) and burped the pipes. Temps were fine after that.

Sorry for the ropey description it was ages ago!
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[mentalboy]

I get a small overheating problem on the 1100 occasionally.
Firstly - she runs slightly hotter when the fluid drops by about 100-150ml (tiny external leak and I lose that over the course of several 1000 miles) so she needs to be kept filled right up - temp gauge lets me know as it sits bang on one point when heated up and running fine

Secondly - there is some kind of glitch in the oil system and she runs hotter when I do an oil change, for a good few hundred miles - more noticeable in the summer months and when stuck in traffic.

Not sure if it's a zed thing as she's done it ever since I had her (from 17000 miles). Coolant (and bleed nipples) is always the first thing I check when that temp gauge needle starts creeping up.
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[Casper]