Engine Rebuild: 5.0 GL Marine Gas - Crankshaft

The crank was degreased in our Hotsy hot chemical bath cleaner. Next, we installed the crank on the polishing lathe where the crank's main and rod journals were polished.

See the surface is now perfectly smooth and polished? The lathe completely removes the foreign material from the surface and is nice and smooth to aid in long bearing life.

After polishing the crank, all journals are measured with precision micrometers to insure correct oil clearance between the journal surface and the bearing shells. Too much clearance will result in low oil pressure. Not enough clearance will result in bearing failure... and a big repair bill.

The rod journal measured in t 2.1228 inches in diameter and the mains measured in at 2.248 inches in diameter. This means it's in the clear for using standard main and rod bearings.

Please keep in mind that all this work is done in house. This way we can insure all machine work is done properly and to usable tolerances which results in longer engine life.

Engine Rebuild: 5.0 GL Marine Gas - Timing Chain Cover

We're still cleaning things up on our customer's 5.0 but here's a quick before and after of a timing chain cover clean up. We degreased then sand blasted to remove scaling and rust.

The part was then sprayed with rust-inhibiting primer and surfaced to make sure there aren't any leaks when assembly is complete.

Engine Rebuild: 5.0 GL Marine Gas - Turning a Pile into Performance

 Here's the start of one of our typical marine gas engine rebuilds.  We'll be walking you through the rebuild step by step and updating you with pictures along the way.

A customer of ours came in yesterday to drop off his 5.0 GL marine gas engine.  

Don't mind the grass chunks!

I think he drug it through his front yard to get it into the back of his truck.

The first step in all our rebuilds is to take an inventory of the parts the customer brought in. This way we know exactly what's here, what's missing and what we will and won't need to order to complete the build. We can also keep track of each customer's property this way.

The next step is cleaning and prepping the block and parts.

  Today we'll be using our glass bead sand blaster, steel abarator, Hotsy ( a steam cleaner) along with solvent and ultrasonic cleaners to get all that rust and crust off.

We'll be back soon with more updates!

Welcome!

Welcome to Cogswell Marine & Motorsports' blog where we're obsessed with horse power and the art of perfecting it!

In this blog we'll be showing our capabilities and knowledge in building reliable horsepower, along with giving tips and trick on how to maintain your marine, gas or diesel, and high performance engines. We'll also showcase our customers engines and some of our personal projects. In the future, we'll set up a FAQ section which will be loaded with detailed info on all your inquiries.

We'll update the blog frequently with sale notices on new and used items and machine shop services. Check back regularly for new sales and specials.