How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Tim's Auto Repair Your Own Question

Tim's Auto Repair
Tim's Auto Repair, Mechanic
Category: Car
Satisfied Customers: 13010
Experience:  Have owned a repair shop for 25 yrs.
14541291
Type Your Car Question Here...
Tim's Auto Repair is online now
A new question is answered every 9 seconds

1998 Mazda 626: It overheated yesterday and I..overheats

Resolved Question:

My daughter has a 1998 Mazda 626. It overheated yesterday and I have changed the thermostat out and it still overheats. I am not a mechanic, but am unemployed so trying to get by. Any suggestions on where to start first.
Submitted: 4 years ago.
Category: Car
Expert:  Tim's Auto Repair replied 4 years ago.

hi

first,lets make sure there is no air in the cooling system...remove the radiator/reservoir cap when the engine is cold...start the engine and let it idle...keep coolant on hand and add when needed..some coolant may gush out with air when doing this so be careful....keep doing this until engine is at operating tempeture and the coolant evens out and quits gushing..then ,install the cap...let it sit and idle to see if the radiator fan comes on..if the engine got really hot,it is possible that it blew a head gasket or even cracked a head

thanks

Customer: replied 4 years ago.
I tried that and it went good except there are two radiator fans and one of them did not come on. While it was idling temp stayed good. I drove it about 1/4 mile down the road and the temp started rising fast. Within five minutes in garage it is idling at normal temp.
Expert:  Tim's Auto Repair replied 4 years ago.

sorry to say...but.it sounds as if the head gasket may be blown

thanks

Customer: replied 4 years ago.

How big a job is replacing a blown head gasket?

Expert:  Tim's Auto Repair replied 4 years ago.

well..it is a fairy big job....what is your engine size and i will try to send you step by step directions

thanks

Tim's Auto Repair, Mechanic
Category: Car
Satisfied Customers: 13010
Experience: Have owned a repair shop for 25 yrs.
Tim's Auto Repair and 6 other Car Specialists are ready to help you
Customer: replied 4 years ago.
The engine is a 4 cylinder.
Expert:  Tim's Auto Repair replied 4 years ago.

ok

this may help

thanks

2.0L Engines

See Figures 8 through 19

  1. Relieve the fuel system pressure and disconnect the negative battery cable. Drain the cooling system.
  2. Remove the splash shield, fresh air duct and air cleaner assembly.

 

FIG : Fig. 8: Exploded view of the cylinder head assembly for the 2.0L engine

image

 

the 2.0L engine

  1. Disconnect the accelerator cable.
  2. Disconnect the following hoses: heater, brake vacuum, purge, fuel, water and upper radiator.
  3. Remove the accessory drive belts. Remove the power steering pump bolts and secure the pump aside with mechanics wire, leaving the hoses attached.
  4. Remove the alternator bracket nut and bolt and position the bracket aside. Detach the exhaust pipe from the manifold.

 

Click image to see an enlarged view

Fig. Fig. 9: To remove the cylinder head, first drain the coolant, then remove the air intake ducting, valve cover, distributor and radiator hose



Click image to see an enlarged view

Fig. Fig. 10: Also disconnect the water bypass hose ...



Click image to see an enlarged view

Fig. Fig. 11: ... as well as the engine wire harness, fuel lines (arrows) and heater hoses



Click image to see an enlarged view

Fig. Fig. 12: If necessary, unbolt the EGR pipe securing bracket from the engine block



Click image to see an enlarged view

Fig. Fig. 13: Remove the timing belt and camshafts from the cylinder head

  1. Label and disconnect the spark plug wires. Remove the power steering hose brackets from the cylinder head cover.
  2. Label and detach the distributor/coil connectors, engine coolant temperature sensor connector, cooling fan coolant temperature sensor connector and temperature gauge sensor connector.
  3. Disconnect the hoses from the cylinder head cover and loosen the cover bolts in 5-6 steps, in the reverse order of the tightening sequence. Remove the cylinder head cover.
  4. Remove the timing belt cover and the timing belt.




Click image to see an enlarged view

Fig. Fig. 14: Loosen the cylinder head bolts evenly in 2-3 steps following the sequence



Click image to see an enlarged view

Fig. Fig. 15: Once all of the cylinder head bolts are loosened remove them along with their washers



Click image to see an enlarged view

Fig. Fig. 16: With the help of an assistant, lift the cylinder head off of the engine, complete with intake and exhaust manifolds



Click image to see an enlarged view

Fig. Fig. 17: Remove the old cylinder head gasket ...



Click image to see an enlarged view

Fig. Fig. 18: ... and, after stuffing rags in the cylinder bores, thoroughly clean the gasket mating surfaces

  1. Remove the coolant temperature sensor housing from the cylinder head. Remove the distributor.
  2. Remove the camshaft sprockets and the camshaft.
  3. Remove the hydraulic lifters. Identify each lifter as it is removed so it can be reinstalled in the same position. If the lifters are to be reused, store them upside down in an oil-filled sealed container.
  4. Loosen the cylinder head bolts, in 2-3 steps, in sequence. Remove the bolts and the cylinder head.
  5. Clean all gasket mating surfaces. Inspect the cylinder head for damage, cracks, and water and oil leakage. Check the head gasket surface for distortion using a straight-edge and feeler gauge. Maximum allowable distortion is 0.004 inch (0.10mm).


To install:

  1. Position a new cylinder head gasket on the cylinder block, and install the cylinder head.
  2. Apply clean engine oil to the bolt threads and seating faces. Install new cylinder head bolts and tighten in 2-3 steps, in sequence, to 13-16 ft. lbs. (17-22 Nm).
  3. Paint a mark on the edge of each cylinder head bolt to use as a reference. Turn each bolt, in sequence, 90 degrees. Again, turn each bolt, in sequence, an additional 90 degrees.




Click image to see an enlarged view

Fig. Fig. 19: When installing the head, tighten the head bolts in sequence to the proper specifications

  1. Apply clean engine oil to the hydraulic lifters and install them in their original positions. Make sure they move freely in the bores.
  2. Install the camshafts and sprockets. Install the distributor and connect the distributor/coil connectors.
  3. Install the timing belt and cover.
  4. Install a new cylinder head cover gasket on the cylinder head cover. Apply sealant to the cylinder head surface in the area adjacent to the front camshaft caps, then install the cover. Tighten the bolts in 5-6 steps, in sequence, to 61-95 inch lbs. (7-11 Nm).
  5. Connect the hoses to the cylinder head cover. Connect the spark plug wires.
  6. Install the exhaust manifold and the alternator bracket. Tighten the bracket nut and bolt to 19 ft. lbs. (25 Nm).
  7. Install the alternator belt and adjust the tension.
  8. Loosely install the power steering pump through and lockbolts. Connect the pump pressure switch connector.
  9. Install the power steering pump belt and adjust the tension. Tighten the pump through-bolt to 45 ft. lbs. (61 Nm) and the lockbolt to 34 ft. lbs. (46 Nm).
  10. Install the power steering pump belt shield and tighten the bolts to 86 inch lbs. (9 Nm). Install the power steering hose brackets to the cylinder head cover, and tighten the bolts to 88 inch lbs. (10 Nm).
  11. Install the coolant temperature sensor housing with a new gasket. Tighten the bolts to 19 ft. lbs. (25 Nm). Connect the electrical connectors at the housing.
  12. Connect and adjust the accelerator cable.
  13. Connect the heater, brake vacuum, purge, fuel, water and upper radiator hoses.
  14. Install the air cleaner assembly, fresh air duct and splash shield.
  15. Connect the negative battery cable. Fill and bleed the cooling system. Run the engine and check for proper operation.

 

 

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician