My car idles a little bit rough. Also I have an oil leak but im not sure where it is from. Recently I noticed some milky film under my oil cap and I think immedietly BHG. But my car never overheats even though it has a crack in the radiator that coolant leaks from. It never smoke sfrom the tailpipe and it runs well. Also recently a little white smoke can be seen when u are looking at the engine, however this appears to be from oil leaking onto the hot downpipe. Im going to have it compression tested tomarrow. Does any one have any idea what else this could be? Or is it for sure a blown head gasket. Any input would be greatly appreciated. Thanks
Bhg???
- Thread starter Nick56289
- Start date
Milky oil residue on your oil cap is a big sign, good chance it's blown. Get a block test and you should know for sure.
Wishfull thinking...I totally understand. But I'll eat my hat (and I have a big head) if that's not a BHG.
Compression test will not tell you for sure. It will tell you that there is something wrong, but not where it is... Leakdown test and / or block test will tell you what it wrong and where the problem is.
Are you doing the compression test yourself, or getting a shop to do it? If it's a shop, ask them about doing leakdown & block instead.
Are you doing the compression test yourself, or getting a shop to do it? If it's a shop, ask them about doing leakdown & block instead.
If you're getting a milky film under the oil cap don't drive it as you're contaminating the oil and Rod Knock won't be far away.
You have to be aware that there are different types of BHG's. Keep in mind that the HG's job is to seal not just one thing, but three (cylinder gases, water lines, and oil channels)! With that said, a blown HG can mean different things: it can mean that there is a leak from the cylinder to the water jacket, or a leak from the coolant to the oil channels, or sometimes from one cylinder to another cylinder...I don't know if a cylinder to oil channel has ever existed on these cars--if it did, one symptom of that would be your dipstick blowing out. Each of those BHG's I mentioned will show different symptoms. If you have an oil passage to water jacket leak, that will NOT affect your cylinders as far as the compression #'s or a leak down test is concerned. Even if you do have a cylinder to water jacket leak, it may be only intermittent and not show up with the relatively low pressure that is present in such testings. (Keep in mind that the combustion pressures [especially with turbo engines] are far greater than the pressures of what a leak down test or compression test will offer.)
If you have what I am suspecting, you may also have an oily residue in your coolant. Check for that as well.
Not to brag about my write up, but it may be of some help to you:
http://supramania.com/forums/showthread.php?t=251
Thanks for the info tony. Your link was very informative. My engine has almost 150k miles on it. However it does have a new head. Do you think it would be a better idea just to get the entire engine rebuilt and have them put in a MHG in the process. I could also get a japanese engine and put a MHG in that one and just drive this one until it breaks. What do you guys think. Give me some feedback. Thanks
if it's an option, it's always a better idea to get the engine rebuilt.
after all, JDM engines arent as good as people portray them....
after all, JDM engines arent as good as people portray them....
I have new news on my BHG. For the past two days there has been no fily residue in my oil and it has been looking really clean. The engine runs well and everything. Does anyone have any idea why this might be or what it might mean? Also I think I have decided to rebuild my engine. Any tips on what to have done and what to do when taking it to a shop?
Nick56289 said:
You could still have a BHG. Did you put-put around town or did you open her up? If you were just barely getting in the throttle you might not have put enough pressure on the HG to force coolant through the weak spot. Do yourself a huge favor & get your problem checked.
Yes, check these threads located in our MK3 Supra Information/Reference section about build ups:Nick56289 said:
Specific 7mgte Rebuild Tips by p5150
http://supramania.com/forums/showthread.php?t=276
7M assembly tips by Adjuster
http://supramania.com/forums/showthread.php?t=5631