Is it possible to blow a MHG?!?

[lppro]

ok so i have the titan 1.4 mm MHG
today i checked the oil level and saw that it looked milkey... not as milkey as when i had BHG before the MHG but i just changed the oil less than 50 miles ago.. and new oil shouldent look like this

i did a comp. test and came back ok... all though i lost a little bit in the 1&2 cylinders...

1=170
2=169
3=179
4=180
5=179
6=180

i did the same test a month ago and this is what they looked like

1=180
2=178
3=181
4=180
5=179
6=180

i drained the oil and took a coolent sample:

so what do you guys think?

oh and there is also crap loads of smoke comming out f the valve cover pvc ports.

it runs excellent and the only thing that has changed is i took the intake mani off to polish it. is it possible i hooked a hose to the wrong port that would cause coolent to get into the oil?

help me figure this out!!! please....

 

[Mr.PFloyd]

which mhg was it? did you remove the rivets?

 

[lppro]

it was the titan 1.4 mm and i dont know i made the mistake of not puting it in my self..

 

[IJ.]

Yes it's very possible.

 

[lppro]

do you think mine is blown? what else could cause this? the motor only has 750 miles on it..

 

[IJ.]

Go grab the Napa Combustion Leak test kit and see what it shows (read the instructions carefully before use)

Sometimes a Comp test won't show anything but the motor will lift the head when it's hot and under boost.

 

[lppro]

what could cause a mhg to blow? im only running 12-15 psi boost on the stock turbo

 

[IJ.]

Incorrect prep usually

Was it ever retorqued?

 

[lppro]

nope... i didnt know it needed to be.. it was torqued down to 90ft lbs. when should i have re torqued it?

 

[Jaguar_5]

Any type of seal can blow, period.

A retorque should be done after about 10 full heat cycles iirc

Why did you go with 90 ft/lbs? ARP Bolts or studs? I think 90 is right only if you're using the bolts, and 30W instead of moly, but this is completely from memory and I'm probably abit off The point here, is to use the specs arp gives, depending on the lubricant used

How did you prep your block & head? Did you check the RA? Was the front plate attached while it was milled?

 

[lppro]

they are arp bolts. and i have no clue about the prepping of the block i had a "professional" do it.. witch was my bigest mistake.. next time i take my car to anyone i will make shure they know wtf they are doing when it comes to supras...

 

[lppro]

would it help if i re torque it now?

 

[Jaguar_5]

i had a "professional" do it.. witch was my bigest mistake..

Ouch! I made the same mistake, but assembled the block myself so made sure it was done right... I still don't have a result yet though.

I went back to the machine shop (who said they've built 7M's before, and then manage to forget the timing cover like I asked!!! wtf?!) at least 5 times, until I finally took it to a different machinist referred by someone in the area that has put together more than one reliable high-hp Supra's using the same machinist.

 

[ImperfectSupra]

i have a mhg and taking my car to toyotat on monday , i will post then

 

[Poodles]

yes, a retorque may help on a MHG... on a normal HG it's pointless usually...

compression looks a bit off, and it's out of spec per the TSRM IIRC (within 14PSI of eachother)

 

[lppro]

the compression is not spec because its bored .40 over with je pistons and it only has 750 miles on it..

 

[Doward]

I seriously doubt the machinist did the retorque - that would most likely be your responsibility.

My ARP studs said 103lbs with 30wt oil.

 

[huntin5L]

I was wondering why those numbers looked high, 157 ish is what the tsrm states.

 

[lppro]

i seriousley doubt i have bhg. but im gana work on it today and see what i can fugure out...

 

[IJ.]

Go grab the Napa Combustion Leak test kit and see what it shows (read the instructions carefully before use)

Sometimes a Comp test won't show anything but the motor will lift the head when it's hot and under boost.

BEFORE turning a wrench.......