BHG within a week? :(

[s!ke]

So, I just recently rebuilt my entire 7mgte motor, and now I am having a BHG scare.

I have an HKS 1.2mm MHG on there so I wasn't worried about it, but I am meeting a few of the bhg criteria.

- Losing coolant/water slowly and often
- Sound of water gurgling in the tailpipe / muffler
- Waterfall / air bubble sounds behind climate control (heater core?)
- Unfamiliar exhaust smells after running the car for some time.

Any thoughts? Should I just shoot myself in the head? Should I just blow up my supra?

1jz ftw?

[BorHor]

= ( go steal one of the 2J's out of one of the mk4s.

[JustAnotherVictim]

What did you do to prepare the gasket?

[s!ke]

I don't know what you mean...

I torqued it correctly (in sequence 40, 60, 75, 85, 90 etc.)
I warmed it up and revved it when i first started the engine.
I had the block and head decked to make it ultra smooth.

?

[crrider80]

did you remember to use a head gasket? lol jp. the gurgling sound is air in the heater core. unless your overheating, have milky oil, brown oily coolant, and smoking you dont have a bhg
-Steve

[bigaaron]

did you remember to use a head gasket? lol jp. the gurgling sound is air in the heater core. unless your overheating, have milky oil, brown oily coolant, and smoking you dont have a bhg
-Steve

With a metal headgasket, it doesn't usually suddenly blow like a stock gasket. It will sometimes seep enough pressure under boost to over pressurize the cooling system. Then the overflow bottle fills up and the engine starts to overheat.

But before you decide to pull the 7m out, make sure you don't just have a small coolant leak somewhere.

[pimptrizkit]

purchase a block check kit from napa and pop your rad cap and warm up the car, test,

put cap back on, boost, then re-test, careful under pressure use a towel, and if test fails both times then your more so lookign at a coolant leak then a head gasket issue,

[chriso]

Before you blow up the car, give me those rims and put the sawblades back on.

[JustAnotherVictim]

:rofl:
Nice Chris.
I meant did you use any type of sealant on the gasket and head+block machined. Just head machined? etc.
Forget that 1jz noise. You're doing better than me at the moment. lol

[starscream5000]

Did you have the rear timing cover machined when/if you machined the block?

[s383mmber1]

(in sequence 40, 60, 75, 85, 90 etc.)

When you say "ect" that makes me really scarred that you went PAST 90....

Did you use ARP hardware? What does the manual say for torque spec?

[starscream5000]

He could have used oil instead of moly...

[91 mK3]

do a compression test and see what numbers your get.

[johnathan1]

Pressure test your cooling system...

[mazzer]

Did you have the rear timing cover machined when/if you machined the block?


+1. :eek3dance

[ViR2]

Is there steam/wet gas coming out of your exhaust? ;)

[s!ke]

When I had the block decked I did have that do that little piece on the back yes.

And I dont remember what number I torqued it to, whatever the TSRM said was the correct torque. I was just showing you an example of the steps I took. I used ARP bolts, not studs.

And I put permatex on each side of the gasket.

And I knew you would be jealous of those rims fasha.

I havent run the car hard at all which is why I am confused, but I am having so many symptoms. I am still learning so thats why I wanted to ask you experts.

[LordLo]

I think you have to retorque bolts after heat cycling them. For studs your supposed to torque/retorque 3-4x before you start your engine to ensure the studs hold proper torque.

[jetjock]

You torqued ARP bolts on a MHG to the TSRM spec?

[supramad77]

Just had mine done with a titan 2mm mhg torqued down to 95fpt. I was also worried by more gurgling noises behind the dash. I have put in a bit more coolant and all seems well at the moment. One you have had bhg you just assume it's happened again.
I would be very worried if you have put stock torque on a metal gasket tho.

[s!ke]

:( I did put stock torque on a mhg.

You guys are scaring me.

[starscream5000]

Stock torque will kill it quick. You should have followed the ARP torque specs on the sheet you got with them. Best get out there now, take the valve covers off the head, crack the bolts loose, and then retorque to the proper spec and pray...

[s!ke]

can anyone find the arp torque specs? various websites i am finding is like 40 - 50 foot pounds.

am i reading it wrong? i thought it was about 90? thats what they are torqued to now.

[mazzer]

can anyone find the arp torque specs? various websites i am finding is like 40 - 50 foot pounds.

am i reading it wrong? i thought it was about 90? thats what they are torqued to now.


the bolts came with instructions. there were different specs for using different lubricants on the bolts.

[starscream5000]

What lubricant did you use? Oil, or the ARP moly lube? PM jdub, he may have a photo of the spec sheet for the bolts, I know for sure that he has one of the studs...

[IJ.]

Goop on a new MHG and incorrect Tq :(

Be surprised if it seals up with a retorque.

[chriso]

Just to clarify.....

The head was installed to about 85-90 ft lbs in several passes. The lube used was redline assembly lube since the original moly lube that came with the bolts was used on the original installation of the head (long story - the head was pulled off and replaced with another during the engine build up). I had called ARP and that's what they told me to use, engine assembly lube !!! They also told me to torque between 80-90 ft lbs.

The torque was correct and the engine/head prep was also correct as well as the MHG installation which was installed dry. The only issue that may concern me is that the MHG was installed with the head torqued once (althought the engine never left the engine stand). I imagine it's possible that some of the factory sealant may have been compromised when the 1st head was replaced and the MHG re-installed although the head gasket looked perfect when re-installed.

A simple re-torque is probably all he needs since he has around 800 miles or so on the rebuild.

[starscream5000]

Sounds like he's just jumping at shadows then ;). The MHG should be fine since it never left the stand.

[racerpage]

So the head was torqued, taken off, replaced with another head and then the same head gasket was used and then retorqued? Save yourself alot of time if this is the case. Redo the MHG with a new one. If that metal compressed with the other head on it, even though they look the same, the other head will compress the metal in different points causing a leak. Lucky you there won't be alot of prep for the new one.

[starscream5000]

I think it's safe to say that if Chriso is having his son do a MHG that he will have the proper RA spec for it on both heads, if that is the case, then it shouldn't matter which head was on there as the surfaces will be near identical.

[Nomad707]

stock HG ft lbs is undertorqued, thus giving the supra its fame for blowing HG's.

i torqued mine to 85 ft lbs on a metal HG.

stock torque on a mhg is bad news.

retorque and pray.

[huntin5L]

I also had a greddy metal installed at 85ft lbs with only the head shaved a few thousands with permatex sealant. I have been going strong for about 18k miles. Good luck with the retourque.

[s!ke]

I apologize for that miscommunication, I was under the impression the TSRM said 90ft lbs. I believe we did it to 90 or possibly 85. But yes, I have no idea where these problems are coming from. I will re torque sometime this weekend when I have time to do so.

Any other ideas where my "problems" might be coming from?

[racerpage]

I think it's safe to say that if Chriso is having his son do a MHG that he will have the proper RA spec for it on both heads, if that is the case, then it shouldn't matter which head was on there as the surfaces will be near identical.
The majic word is near.

[johnathan1]

The majic word is near.

magic

[bigaaron]

I would have used Copper Permatex, this thread would have never happened. :dunno:

[vas85]

So, I just recently rebuilt my entire 7mgte motor, and now I am having a BHG scare.

I have an HKS 1.2mm MHG on there so I wasn't worried about it, but I am meeting a few of the bhg criteria.

- Losing coolant/water slowly and often
- Sound of water gurgling in the tailpipe / muffler
- Waterfall / air bubble sounds behind climate control (heater core?)
- Unfamiliar exhaust smells after running the car for some time.

Any thoughts? Should I just shoot myself in the head? Should I just blow up my supra?

1jz ftw?

Check your Heater Hose Unit... should be near the firewall with 2 roughly 3/4'' rubber hoses.... don't know which side it is for the LHD MK3's, but mines was coroded from that spot so whenever I filled the plastic reserve tank with coolant it would spurt out of that spot slowly but it'd happen... then i'd drive out of the driveway to work thinking "hmm... why on earth is there some water underneath...." and I then traced it to that... don't know if it's a common thing but it happend on mine can happen on any car really..., so check those spots out I guess...

[JustAnotherVictim]

I would have used Copper Permatex, this thread would have never happened. :dunno:




And I put permatex on each side of the gasket.


He did. ;)
That could be part of his problem if the gasket was new.

[starscream5000]

Goo FTL :(.

[bigaaron]

He did. ;)
That could be part of his problem if the gasket was new.

Lies. LOL

[chriso]

And I put permatex on each side of the gasket.

I don't think so.....the head gasket went on dry like it is supposed to.

[JustAnotherVictim]

Chris, talk to Chris and get this sorted out. :biglaugh:

[s!ke]

Well we put permatex on pretty much every other gasket, so I guess I got confused as to which gaskets we lubed.