Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River,

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Presentation transcript:

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 1 FIGURE 25–1 An air-powered grinder attached to a bristle pad being used to clean the gasket surface of a cylinder head. This type of cleaning pad should not be used on the engine block where the grit could get into the engine oil and cause harm when the engine is started and run after the repair.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 2 FIGURE 25–2 An abrasive disc commonly called by its trade name, Scotch Brite™ pad.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 3 FIGURE 25–3 Using baking soda is the recommended way to clean engine parts because any soda that is left on or in the part is dissolved in oil or water, unlike either sand or glass beads, which can be engine damaging.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 4 FIGURE 25–4 Small engine parts can be blasted clean in a sealed cabinet.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 5 FIGURE 25–5 A pressure jet washer is similar to a large industrial-sized dishwasher. Each part is then rinsed with water to remove chemicals or debris that may remain there while it is still in the tank.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 6 FIGURE 25–6 A microbial cleaning tank uses microbes to clean grease and oil from parts.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 7 FIGURE 25–7 (a) A pyrolytic (high-temperature) oven cleans by baking the engine parts. After the parts have been cleaned, they are then placed into an airless blaster. This unit uses a paddle to scoop stainless steel shot from a reservoir and forces it against the engine part. The parts must be free of grease and oil to function correctly. (b) This cleaned engine block has been baked and shot blasted.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 8 FIGURE 25–8 An ultrasonic cleaner is used to clean fuel injectors.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 9 FIGURE 25–9 The top deck surface of a block is being tested using magnetic crack inspection equipment.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 10 FIGURE 25–10 If the lines of force are interrupted by a break (crack) in the casting, then two magnetic fields are created and the powder will lodge in the crack.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 11 FIGURE 25–11 This crack in a vintage Ford 289, V-8 block was likely caused by the technician using excessive force trying to remove the plug from the block. The technician should have used heat and wax, not only to make the job easier, but also to prevent damaging the block.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 12 FIGURE 25–12 To make sure that the mark observed in the cylinder wall was a crack, compressed air was forced into the water jacket while soapy water was sprayed on the cylinder wall. Bubbles confirmed that the mark was indeed a crack.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 13 FIGURE 25–13 A cylinder head is under water and being pressure tested using compressed air. Note that the air bubbles indicate a crack.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 14 FIGURE 25–14 (a) Before welding, the crack is ground out using a carbide grinder. (b) Here the technician is practicing using the special cast-iron welding torch before welding the cracked cylinder head. (c) This is the finished welded crack before final machining. (d) Note the finished cylinder head after the crack has been repaired using welding.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 15 FIGURE 25–15 Reaming a hole for a tapered plug.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 16 FIGURE 25–16 Tapping a tapered hole for a plug.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 17 FIGURE 25–17 Screwing a tapered plug in the hole.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 18 FIGURE 25–18 Cutting the plug with a hacksaw.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 19 FIGURE 25–19 Interlocking plugs.

Automotive Engines: Theory and Servicing, 7/e By James D. Halderman Copyright © 2011, 2009, 2005, 2001, 1997 Pearson Education, Inc., Upper Saddle River, NJ All rights reserved. 20 FIGURE 25–20 (a) A hole is drilled and tapped for the plugs. (b) The plugs are installed. (c) After final machining, the cylinder head can be returned to useful service.