The Ford F-150 contains either a V6 or a V8 engine, while the F-250 and F-350 trucks aspect the Election of a V8 or V10 engine. For the 2008 mannequin year, Ford further introduced the F-450 Motor lorry, which contains a V8 engine. When the engine in one of these convincing trucks is running poorly, losing competency or burning oil, a compression evaluation is an elementary approach to diagnose the disputed point.
1. Glowing up the engine in the Ford Motor lorry completely before performing the compression assessment. Running the criterion on a benumbed engine produces inaccurate results. This rotates the engine and builds compression within the cylinder. Record the compression number and repeat the procedure for each of the remaining cylinders. There will be a record of six, eight or ten numbers when you finish, depending on the engine size.
Provided the Motor lorry contains a V6 engine, there Testament be apart six spark plugs, nevertheless whether it contains a larger V8 or V10 engine, there Testament be either eight or ten Glimmer plugs. Contemplate the Glimmer plugs for damage thanks to this is a comment of problems within that cylinder.
3. Involve the compression tester into one of the Glimmer plug holes and Eccentric person the starter. Be certain that the engine in the Motor lorry is in capital shape thanks to it Testament committal to spin the engine diverse times during the check.2. Disable the ignition method to avoid the opportunity of electrical shock during the compression elimination and remove all of the Glimmer plugs from the engine.
4. Compare the compression numbers to the recommended compression ratio for a Ford F-series truck to see if they fall within 15 PSI of that number. For an F-150 with a V6 engine, the compression ratio is 9.2:1, and for one with a 5.4L V8 engine, the ratio is 9.8:1. For both F-250 and F-350 trucks with a 6.0L V8 engine, the ratio is 18.0:1, but if the truck contains a V10 engine, the ratio for 2007 and 2008 models of these trucks is 9.2:1 and 9.0:1 for the 2004 through 2006 models. Compression ratios vary for all other V8 engines in these models by year and liter.
5. Evaluate the results by comparing the compression numbers to each other extremely. They should be similar and fall within 10 PSI of each other. Retest any cylinders with a low reading after adding a small amount of motor oil to the cylinder. If the number increases, the cylinder contains worn walls or piston rings, but if it stays the same, there are worn valves or valve seats instead.