Our Customers Say:

  • Just wanted to give a big thanks for the order! Arrived in record time, and appreciate the bonus ... read more

    Ted

  • Gday manny received fj40 order today and all is there and everything is perfect thanks for your help ... read more

    cheers luke

  • Great Customer Service !!! It is nice to find a company that has Integrity !!! Thank You !!!

    Tim Fox

  • I just recieved my first order from CCOT - It got here in one day - !!! - and It was exactly right! ... read more

    Wayne Doyle

  • Thanks again for your awesome service - I'm a big fan of your shop. You're really helping me ... read more

    Cheers, Brad

  • Thanks, you guys rock!

    Steve

  • By the way....you guys are awesome at Coolcruisers.

    Brenda

  • Manny .....Radiator was waiting for me when I got home Fri. P.M. .....all new hoses ( from a ... read more

    Gary

  • I received my order in record time and have already installed the parts - perfect fit! Thanks much.

    Dean

  • Thank you, Manny. By the way. I love the new lift. WOW! It's awesome!

    Craig

  • Thank you. The rear quarter panels arrived safe and sound. Better than I had hoped for. I'll be ... read more

    Jim

  • Great customer service!!!! Keep it up!!!!!

    Mel

  • I have finished installing all of my CoolCruiser weatherstrip around both front doors and the three ... read more

    Lenny

  • I just finished installing my CCOT Replica gas tank, and it's one of the best fitting ... read more

    Craig

  • Just whant to say thank you to all at ccot received my order and it is great to deal with such a ... read more

    Quartus Reyneke

  • I have restored a number of cars as a hobby. The restoration process of my FJ40 however has been ... read more

    Jan, Dubai, UAE

  • I just wanted to really thank Coolcruisers for all of your help with everything. Everything you ... read more

    Alistair Parr

  • Hi there,have received my order today, thanks for your excellent service. The parts are perfect, ... read more

    Peter Foster

  • Just a note to thank you for the excellent parts and service. The order arrived in Montana in 3 ... read more

    Thanks again, Kirk

  • I got the parts I ordered. They are fantastic! Nice quality and they appear to fit well. Thanks for ... read more

    Blair Bishop

  • Thank you for your amazing help, I received my order today and am very happy with your service and ... read more

    Big Cheers from Australia, Tony

  • Just wanted to say Thank You! I won a set of FJ-40 Window hinges Cool Cruisers donated to the Raffle ... read more

    Jerry

  • RECEIVED MY ORDER TODAY WAS AS USUAL PERFECT AND IS PART OF THE LAST STAGES TO COMPLETE MY SONS 71 ... read more

    MLMIII

  • Just letting you know that I received my order today. Can't believe how quick it came. Thank you ... read more

    Aaron

  • Just installed my designer HFS lift kit and love it.

    Mark

  • Just wanted to thank you for making this replacement gas tank available. Fits a 1976 FJ40 ... read more

    Jim

  • Thanks guys I just received my order everything looks spot on.. I appreciate your awesome packing ... read more

    Julian

  • FYI, the last shipment from you arrived today and as expected, the quality of the parts is ... read more

    Cheers, Robert, UAE

  • Manny, Radiator install went great and FJ60 is running cool again thanks to Cool Cruisers! ... read more

    Semper Fidelis, Chris

  • just wanted to let you know the parcel arrived today with no issues. Top quality parts and truly ... read more

    Cheers, Robert, Dubai

  • Parcel arrived today thank you. The rear door repair sections look great.

    Cheers, Lawrence from Australia

  • Just wanted to say thanks for the super fast shipping, right parts shipped, and cool poster with ... read more

    Chad Helena, MT

  • I received my parcel this morning 10.00am Monday morning, doesn’t get much better than that, thanks ... read more

    Regards, Troy from Australia

  • Received my order in short order and it worked great..........Thanks, You guys are great.

    Phil Zito

  • I just got a packages from you. All perfect. Thank you very much. You have +1 regular customer from ... read more

    Best regards, Alexey

  • Mary package arrived today. Very pleased with the quality of the parts and the prompt delivery.

    Ken from Australia.

  • Good Morning Manny. Just wanted to let you know the shipment was received yesterday. I appreciate ... read more

    Sandra Latimer

  • I don't believe it, my 76fj40 was leaning to the driverside a lot and it seemed worse after a ... read more

    Charles Rogers

  • I'd like to thank you for all your support and assistance in helping build the suspension of my ... read more

    JC Mosquera

  • Just to follow up: UPS delivered the seat covers on Friday. And you are right: Oscar is really ... read more

    R Evers

  • Dear Cool Cruisers, I just have to say your Customer support on this issue was Awesome! Y’all are ... read more

    Jim Wolff

  • Manny, I want to thank you & staff for the 3/4 tub arriving intact & undamaged! A real nice job! ... read more

    Dave

  • Hey Manny, Got the tub and it is awesome! thanks

    jd

  • Mary Beth, Please pass on my appreciation to all involved in the purchase, distribution and ... read more

  • My goods arrived today which is 2 days earlier than the scheduled time. Upon opening the packages I ... read more

    Ken White, Australia

  • Dear Mary Beth,

    This is to let you know that I have received both boxes and also that I am very pleased with all the items you have supplied me.Thank you for all your kind assistance. Best regards Chanaka, Sri Lanka

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Head Gasket, Blown, Is this serious?

My mechanic says my engine has a blown head gasket. Is this serious?

Answer:

It is because (1) it will be expensive to replace, (2) it is probably the result of some other underlying problem, and (3) additional repairs may be required in addition to replacing the head gasket itself.

The head gasket seals the cylinder head to the block. When it blows, it may allow coolant to leak into the engine's cylinders and/or allow compression to be lost between adjacent cylinders or to the outside.

WHY HEAD GASKETS FAIL

Head gaskets typically fail at the weakest point, which is the thinnest area between adjacent cylinders. The gasket cracks or burns through, allowing compression to leak between the cylinders. This causes a drastic drop in power that is hard to ignore. The engine may still run, but very poorly.

If the gasket leaks coolant, it may cause the engine to overheat. Coolant in the crankcase or cylinder is also not a good thing to have because it dilutes the oil and accelerates wear. If enough coolant leaks into a cylinder, it may even "hydrolock" the engine preventing it from turning over when you attempt to start it.

Conditions such as engine overheating and abnormal combustion (detonation and/or preignition) can also cause a head gasket to fail.

Improper installation may be another factor. If the person who installed the gasket did not torque the head bolts in the proper sequence or to the specified value, it can cause the gasket to leak and fail. Also, if the head and block were not clean, flat and finished properly (too rough a surface finish) when the gasket was originally installed, it could contribute to a leakage problem.

GASKET REPLACEMENT

To replace a blown head gasket, the cylinder head must be removed from the engine.

Once the head is off, the mating surfaces of both the head and block should be inspected for flatness as well as any damage that might have contributed to the gasket's failure or might prevent a new gasket from sealing properly. If the head is warped, it will not seal the new gasket properly and sooner or later it will again fail. Resurfacing and/or straightening the head may be necessary. An inspection of the head may also reveal cracks or other damage that will have to be repaired before it can go back on your engine.

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