Question 1

What Steps Should Be Taken Before Inspecting the Engine Block on an Acura Integra?

Accepted Answer

Before inspecting the block, it should be cleaned. Visually check for cracks, rust, and corrosion, and look for stripped threads in the threaded holes. It's advisable to have the block checked for hidden cracks by an automotive machine shop equipped for this work. If defects are found, repair or replace the block as needed. Check the cylinder bores for scuffing and scoring, and assess the cylinders for taper and out-of-round conditions by measuring the diameter at the top, center, and bottom of each cylinder bore, both parallel and perpendicular to the crankshaft axis. The taper is determined by the difference between the top and bottom bore diameters, while the out-of-round specification is the difference between the parallel and perpendicular readings. Repeat this for the remaining pistons and cylinders. If the cylinder walls are badly scuffed, scored, or out-of-round or tapered beyond limits, have the engine block rebored and honed at an automotive machine shop, requiring oversize pistons and rings. Use a precision straightedge and feeler gauge to check the block deck for distortions by laying the straightedge diagonally across the block from end to end. If the cylinders are in good condition and within limits, and if proper piston-to-cylinder clearances can be maintained, rebore is unnecessary, and honing will suffice.

Question 2

How can one prepare for inspecting the Engine Block and accurately check for defects and measure cylinder bores on an Acura Legend?

Accepted Answer

The block should be cleaned first, before inspection. Check visually for cracks, rust and corrosion and strips threads in threaded holes. You should have the block looked for hidden cracks by an automotive machine shop qualified for that work. Block if possible and if defects are found, then repair or replace. Have the cylinder bores measure for scuffing and scoring, i.e., check the diameter at the top, center and bottom and parallel to the crankshaft axis. As time goes on, you will learn how to accurately measure so work slowly and repeat checks until the accuracy is satisfactory with you. In case, the measuring precision tools are unavailable, feeler gauge stock is available at auto stores, it can be used to get piston to cylinder clearances. Check clearance with a feeler gauge between the piston and cylinder on the thrust face and insert a feeler gauge to the matching piston position, checking it is between the piston and cylinder, not piston stuck down inside the cylinder. If the piston falls through the cylinder with little pressure there is excessive clearance and a new piston is required. The cylinder is tapered, if the piston binds at the lower end with loose spot, if any tight spot encountered while rotating the piston/feeler gauge." Repeat for the other pistons and cylinders. Oversize pistons and rings are needed if the cylinder walls are badly scuffed, scored, out of round or tapered so far that the engine block must be rebored and honed by an automotive machine shop. On the block deck check for distortion with a precision straightedge and feeler gauge; if worse than specified, distortion can be resurfaced in an automotive machine shop. Obviously, if to rebore is unnecessary and if the cylinders are in reasonable order, albeit worn to some extent, and if the necessary piston to cylinder clearance can be maintained, honing will suffice.

Genuine Acura Engine Block

182 Engine Blocks found

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Acura Cylinder Block General Assembly

Acura Cylinder Block General Assembly

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Acura Engine, Sub-Assembly

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Acura Engine Sub-Assembly (Block)

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Acura Engine, Sub-Assembly (Block)

Acura General Assembly, Cylinder Block (Dot)

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Acura Cylinder Block Assembly

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