HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Leak at rear of engine

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Leak at rear of engine

Post  Bluemach1 on Sat Nov 14, 2009 4:43 pm

Seperated trans from engine today to find that the rear seal is leaking. Actually I think it might be the plug behind the pilot bearing. I found a post on another site that deals with this and even has a short clip. Here is the link: [You must be registered and logged in to see this link.]

I will replace the seal and the plug at the same time. I understand that there is a tool needed for the seal.... Could use some more direction on this.


Here are pictures of the leak from my engine:
[You must be registered and logged in to see this link.]

Bluemach1

Posts : 437
Join date : 2009-08-18
Location : Cameron Park, CA

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Re: Leak at rear of engine

Post  944-LT1 on Sun Nov 15, 2009 3:30 am

Oh yeah! There be a plug back there! That sucks a bit.

"These engines use a unique crankshaft design that allows for free air movement between
the lower crankcase portions when installed. To facilitate that function, the crankshaft is
drilled from the rear centerline toward the front, passing through the rear four main journals.
The hole created in doing so must be sealed with a cup-style plug to prevent oil from
leaking externally.
The cup plug must be installed to a depth of 1.228 - 1.240” (31.2 - 31.6 MM)."

A cup plug has been developed to stop any leakage that may occur in this area and can be ordered under p/n WPC-340, which must be ordered through the Warranty Parts Center.

Clean the crankshaft flange bore area with brake clean or equivalent. Thoroughly dry the area and examine the bore surface for irregularities. If the bore surface needs additional cleaning, use sand paper or equivalent and clean as necessary. Once the crankshaft bore is clean and smooth, apply a thin bead of Loctite 620 completely around the inside of the crankshaft flange bore.

General Motors offers a tool to perform the installation and is shown in the figure below. If the tool is not available through local dealership, an aftermarket equivalent is acceptable.

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Position the crankshaft service cup plug into the crankshaft flange bore with the service cup plug, dish side outward. Do not use hammer to drive the service cup plug into place. Damage to the crankshaft thrust bearing may result.

Assemble arbor, forcing screw, attaching bolts and socket. Install the tool press assembly to the end of the crankshaft flange and position the socket and service cup plug into the bore of the crankshaft flange.

The forcing screw will fit inside an 18 mm or 19 mm end of the impact style socket with the 1/2" drive side of the socket facing the service cup plug. The forcing screw should bottom on the 15 mm step inside the socket.

Hand tighten, forcing screw into the socket, making sure that it is centered on the service cup plug. Mark forcing screw and arbor for reference, then tighten forcing screw two complete turns and an additional 90 degrees or 1/4 turn more.

When completed, remove installation tool assembly and confirm the installation depth of the service cup plug. Place a straight edge across the center of the crankshaft flange as the measurement point. Measure from the straight edge to the center of the installed cup plug. The depth of the installed cup plug should be 1.228 - 1.240” (31.2 - 31.6 MM).

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Re: Leak at rear of engine

Post  Bluemach1 on Sun Nov 15, 2009 10:40 am

Very good post, 944-LT1!

THANKS!

Bluemach1

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Re: Leak at rear of engine

Post  944-LT1 on Sun Nov 15, 2009 1:14 pm

Welcome...hope you get it fixed! Very Happy

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Re: Leak at rear of engine

Post  Bluemach1 on Sun Nov 15, 2009 1:25 pm

Just another bump in the road!

BTW, I was looking up the WPC-340 and it looks like ths is for the 5.3L. I will verify with GM if I can use this on the 5.7L. Appearently there was an issue with porosity on the crank of the 5.3 and this was a service issue? Therefore, the seervice P/N WPC-340.

I also found P/N's 24502262 and 110044811 (both GM)


Thanks again. The Chilton manual is nearly worthless.

Bluemach1

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Re: Leak at rear of engine

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