gsportcars Posted June 15, 2007 Share Posted June 15, 2007 I have recently fitted a 2jz-gte into my IS200 with a single turbo. Due to a few electrical problems upon start up I came to find that when the engine idles for about 20 mins or more it starts to build up A LOT of white gunk around the oil filler cap. I first put this down to water lying in the engine as I had the cam covers off to sand blast and paint them (I had to hose them to get rid of all the sand). I must say that at this stage the engine had only idled due to only having the idle map done and not a full map. After several oil changes to try to flush the engine we got down to mapping. when I set off there was still a small bit of white showing on the oil cap, but by the time we had done a few full throttle runs I checked the cap again and it was clear. After the crankshaft oil seal failing I returned home. Once the seal was replaced and engine started again I noticed that after idling again for a while the white gunk started to re-appear. I know this would tell you that the head gasket is knackered but nothing else would suggest this. the engine runs fine and there are no other signs at all. I have read some posts on here which have mentioned about various breather systems and problems with them but I can't see that being the cause either. The breather on my exhaust side is running into a greddy catch tank and then vented to atmosphere. I simply want to rull out any other possibilites before having to pull the head gasket off. Any help is much appreciated.... Thanks, Gav. Quote Link to comment Share on other sites More sharing options...
paul mac Posted June 15, 2007 Share Posted June 15, 2007 do a search on this mate, if your not losing water stop worrying they all do it Quote Link to comment Share on other sites More sharing options...
Guest supra_55 Posted August 25, 2008 Share Posted August 25, 2008 hey mate did you found out what cause it because my supra is doing the same thing Quote Link to comment Share on other sites More sharing options...
SteveR Posted August 26, 2008 Share Posted August 26, 2008 Nither of mine have ever had a build-up of white gunk under the oil fillter cap - the only car I've owned and this happened to it was a head gasket failure. A bit of white stuff could be condensation, but regular, repeated, large build-ups would be something serious to my untrained mind. Quote Link to comment Share on other sites More sharing options...
Thorin Posted August 26, 2008 Share Posted August 26, 2008 do a search on this mate, if your not losing water stop worrying they all do it Mine doesn't. Quote Link to comment Share on other sites More sharing options...
paul mac Posted August 26, 2008 Share Posted August 26, 2008 Mine doesn't. in the automotive world mate your car is unique , any engine will build up moisture in the oil (usually winter) which shows itself on the underside of the oil cap, if you are pottering around town without getting the car hot it will stay there until you get the car hot such as a blat on a motorway at which point it evaporates, i just thought i would post this for info as people are obviously still doing a search on this Quote Link to comment Share on other sites More sharing options...
Thorin Posted August 26, 2008 Share Posted August 26, 2008 in the automotive world mate your car is unique Well mine and both of SteveR's... Quote Link to comment Share on other sites More sharing options...
SteveR Posted August 26, 2008 Share Posted August 26, 2008 It's not quite but not far off being a sealed system, how would moisture get in there? As you say, some condensation can be normal (though like I say I don't get any), but I'd certainly be worried about large amounts building up. Quote Link to comment Share on other sites More sharing options...
SUPRASUZUKI Posted August 26, 2008 Share Posted August 26, 2008 Have a look here --- http://www.mkivsupra.net/vbb/showthread.php?t=136787&highlight=COMBUSTION Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 26, 2008 Share Posted August 26, 2008 Its far from being a sealed system Steve, it breathes into the inlet system pre turbos which is only just upstream of a whopping great hole that your airfilter attatches to lol. If its idling for a while the engine wont get warm enough to boil the condensation off, so it mixes with the oil in the cap. Quote Link to comment Share on other sites More sharing options...
SteveR Posted August 26, 2008 Share Posted August 26, 2008 Fair play, I learn something new every day. I've read the other thread and don't see a mention -quote "a LOT" -unquote of white gunk, so I'd still worry if that were mine. Quote Link to comment Share on other sites More sharing options...
Guest supra_55 Posted August 27, 2008 Share Posted August 27, 2008 well about a week ago i did the headgasket on my car, and i didnt bolt it down properly and when i fill it up with water it started to come out between the head and the block because i didnt turn the head bolt another 90* so i did. after all that i put it all together then ran it for a whille then drain the oil. i put new oil in her and now i get the same problem as gsportcars so what i want to know is did i stuff the headgasket by not turning the bolts another 90*and is that why get a bit of water only on the oil cap Quote Link to comment Share on other sites More sharing options...
SteveR Posted August 28, 2008 Share Posted August 28, 2008 well about a week ago i did the headgasket on my car, and i didnt bolt it down properly and when i fill it up with water it started to come out between the head and the block because i didnt turn the head bolt another 90* so i did. after all that i put it all together then ran it for a whille then drain the oil. i put new oil in her and now i get the same problem as gsportcars so what i want to know is did i stuff the headgasket by not turning the bolts another 90*and is that why get a bit of water only on the oil cap There is an order to which bolt you should tighten after and before which other bolts - which ensures you achieve a uniform 'squish' across the head/head gasket. Just as important is tightening to the correct torque. If you did neither, I'd take it all off again and do it properly next time, sorry! Quote Link to comment Share on other sites More sharing options...
AndyT Posted August 28, 2008 Share Posted August 28, 2008 well about a week ago i did the headgasket on my car, and i didnt bolt it down properly and when i fill it up with water it started to come out between the head and the block because i didnt turn the head bolt another 90* so i did. after all that i put it all together then ran it for a whille then drain the oil. i put new oil in her and now i get the same problem as gsportcars so what i want to know is did i stuff the headgasket by not turning the bolts another 90*and is that why get a bit of water only on the oil cap There is an order to which bolt you should tighten after and before which other bolts - which ensures you achieve a uniform 'squish' across the head/head gasket. Just as important is tightening to the correct torque. If you did neither, I'd take it all off again and do it properly next time, sorry! Do that asap Supra_55 On the oil in cap problem. Mine had a little after standing for a couple of months. It disappeared after a nice drive. Quote Link to comment Share on other sites More sharing options...
Guest supra_55 Posted August 30, 2008 Share Posted August 30, 2008 thanks guys for your help ill just buy a new gasket and head bolt [sAD][/sAD]and do it right this time Quote Link to comment Share on other sites More sharing options...
jevansio Posted August 30, 2008 Share Posted August 30, 2008 I was paranoid about mine, saw white gunk all through the winter when it was doing short runs, took well into the summer for it to disappear completely Quote Link to comment Share on other sites More sharing options...
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