Head Bolt Repair

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Head Bolt Repair
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Last time we talked about the two areas of the engine that affect rotation: the externals and the internals. For those new to the article series, we are talking about a seized up engine, or an engine that refuses to rotate.

What was not discussed was what are the most likely problem areas on an engine that would cause it to seize up?

First thing I would do is take two parts off the engine so that you can access the most common problem areas:

- The Blower Housing

- The Cylinder Head

(Disassembly Note: Keep all the bolts in the correct alignment and order for the cylinder head. Also take care with the head gasket to keep it in the correct alignment. Think of this as a 3-D puzzle and you are putting the sections of the puzzle aside for reassembly.)

Okay once you have gotten the cylinder head off and the blower housing off you be looking for a couple of things:

-Rusted Flywheel to the magneto

-Rusted cylinder

-Rusted main shaft to the lower bearing.

-Seized up engine due to overheating....

9 times out of 10 it is the flywheel rusted to the magneto. If this is an old engine, you will probably have points. Not to worry, just pop off the flywheel and replace the points (they are available at the local hardware store. Or is you are ambitious, just buy the conversion kit (pretty easy really) and never have to worry about points again!)

A rusted cylinder is pretty serious, but not an impossible task. The nice thing about aluminum cylinder engines is that the aluminum and rust don't bond, so you can actually break free the rusted cylinder. The way to do this is to spray the cylinder with penetrating oil and let sit for 4 to 5 hours. Put the cylinder upright so that gravity is working to pull the penetrating oil into the rusted areas.

Then gently take a piece of wood (very soft preferably pine) and place it on the top of the piston. Tap the top of the piece of wood with a hammer. This generally breaks free the frozen piston. You may discover that NO movement has occurred. There is a slight chance that the piston may be at top dead center. We are assuming it is not. (One FYI... make sure the blower cover, or the cord return mechanism is not connected. This will work against you if the piston wants to go down and force the engine to go backwards!)

The rusted main shaft, is hard to tell if that actually has occured, unless you know some of the history of the engine prior to purchase. Meaning, did the engine sit idle for 3 years outside? Was the oil reservoir full when you opened looked in?

The last question is probably the most important, because it will let you in on a couple of things prior to even BUYING the engine.

If there is not oil, then the question is: what is there in the crankcase? Water? or Nothing?

To tell if there is water, or was water, look for rust colors in the bottom of the oil fill hole. If no oil, then there will be oil residue, with lots of chunks, but not much else. There may be a little oil, but it may have run dry.

If there was water, then you may, have a rusted lower bearing, and perhaps most of the innards (though unlikely) rusted. If that is the case then disassemble the engine, by taking off the outer crank case cover.

If there was little or no oil, check the walls of the cylinder for excessive scoring. When I mean scoring I mean gouges, or scratches, or even marks that resemble melting on the cylinder walls. Gouges and scratches typically will fair okay, but a large melt mark will be trouble and will require honing, and a new oversized piston and new rings. (Just so you know, I have oversized my engines a couple of times and have had minimum success. They end up turning into mosquito abatement machines in short order...!)

You will discover that most engines are not that serious as any of the things I have discussed.

But say it is, then we need to go down each trail...

Bottom line is we do not know what is going on inside the engine, we need to take a sneak peek. The quickest way to find out something is to check the cylinder.... The second is to check the insides...that is a little more involved and will require a whole new article!

And one last FYI: If the engine was mounted to a water pump, then more than likely the engine has a rusted end bearing. If the engine has a rusted end bearing, then the internals of the engine are more than likely rusted.

Water pump engines are usually junk, and are only good for parts such as pistons, valves, carbs.

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And for those with Vertical Lawnmower Engines, there is a special section just for you! Don't throw away that vertical engine just yet!

Automotive Engine Tune Ups, Engine Repair And Engine Replacement

Automotive engine tune ups, engine repair and, possibly, engine replacement are crucial processes that every vehicle owner should know about. Your best resource would be a trustworthy and highly skilled automotive mechanic in Tampa who is an expert in auto repair and truck repair as well as auto inspection and not just auto oil change. Your engine is just as valuable as your car transmission system. If you need any car parts replacement, make sure your automotive mechanic in Tampa supplies you with genuine car parts such as those from AC Delco.

The engine tune up is a crucial component of your overall preventive maintenance regimen. It means the routine servicing of your vehicle engine based on the instructions of the vehicle manufacturer in your owner’s manual. The steps in the tune up and the recommended frequency are all in the manual. This may include the inspection of emission controls and the ignition system; possible replacement of certain components of the ignition system such as the rotor button, distributor cap and contact breaker; adjustment of the valve, air-fuel mixture and carburettor idle speed; re-fastening of the cylinder head bolts; and replacement of spark plugs and filters like the air filter. In modern vehicles, though, engine tune ups can be done as seldom as once every ten years.

Despite engine tune ups, vehicle engines can still break down due to various factors. You, as the vehicle owner, will then have to decide between engine repair or engine replacement. If you find engine replacement to be more cost effective, you will have to decide between a brand new engine, a used engine or a remanufactured engine.

Your automotive mechanic in Tampa will most probably tell you that engine repair will only be worthwhile if your vehicle is not yet ten years old and still has a market value of over $2,000.00. If your vehicle is older, any engine repair will do nothing to increase its resale value.

Your automotive mechanic in Tampa will also tell you if your engine is still repairable. It would be very expensive and no longer worthwhile to still repair an engine that has locked up or has ran for more than 150,000 miles, burns oil, or makes strange noises. In these cases, you should either replace your engine or your entire vehicle.

When replacing your engine, a brand new engine is, of course, the most expensive option. This is also called a crate engine and it comes ready for installation, with a solid warranty. Crate engines are practically identical to your original vehicle engine, or they may be even better with upgrades from the same manufacturer.

Your next option is a remanufactured engine. This is a used engine that has been completely overhauled and rebuilt, meeting or even exceeding the specifications of original equipment manufacturer engines. They are cheaper than crate engines but also come ready for installation and with solid warranties. They are also more eco-friendly because of the recycling of the engine.

A used engine that has not been remanufactured is not a reliable option at all even if it is very much cheaper. Choose this at your own risk.

When getting engine replacement with a crate engine or a remanufactured engine, ask your automotive mechanic in Tampa to check its compatibility with your vehicle.

To ensure that you will not need automotive engine repair and engine replacement any time soon, be diligent about your regular preventive maintenance procedures and engine tune ups. The time will come, however, when automotive engine repair or engine replacement becomes inevitable. When that time comes, make sure you have your reliable automotive mechanic in Tampa to do a proper job for your vehicle.

About the Author

Guy’s Automotive

3049 W.Hillsborough Ave.

Tampa, FL 33614

Phone: 813 353-1537

Fax: 813 353 1568

Email: guyskiver@msn.com

Website's: WWW.AUTOREPAIRINTAMPA.COM, WWW.GUYSAUTOSHOP.COM

where can i find a head bolt repair kit for a cadillac 4.6 north star engine?

Cadillac dealership or your local auto store.

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