Diesel compression test Ford 3600 what size of injector adaptor

[johnharris]

Before I take the head off , thought id do a compression test on the engine, but what is the correct adaptor size to use, all the kits I find are in metric m20, m22, m24, the diameter of the injector body is 21.3mm (0.84inches). Advice on this please. Thanks john

 

[HarleyHetz]

Based on this chart: Thread - Drill & Tap Chart
I'd say that an M24 would be what you'd want since you would drill a 21mm hole for an M24 X 2.5 tap...

 

[johnharris]

Thanks Harley for your feedback, useful chart. Will look at getting a test kit now.

 

[HarleyHetz]

No problem, good luck!!!

 

[RickB]

Based on this chart: Thread - Drill & Tap Chart
I'd say that an M24 would be what you'd want since you would drill a 21mm hole for an M24 X 2.5 tap...

Thanks Harley for your feedback, useful chart. Will look at getting a test kit now.

No problem, good luck!!!

What on earth does a 24MM tap have to do with a compression tester for a ford engine???????????????

 

[HarleyHetz]

What on earth does a 24MM tap have to do with a compression tester for a ford engine???????????????

Well, nothing except the thread size...which was what the original question was...

 

[RickB]

Well, nothing except the thread size...which was what the original question was...

OP never mentioned threads. Bosch injectors do not thread into Ford heads. Every Ford diesel engine built in Basildon England from 1965 to 1999 uses the same compression tester adapter, and it does not thread in.

 

[HarleyHetz]

OP never mentioned threads. Bosch injectors do not thread into Ford heads. Every Ford diesel engine built in Basildon England from 1965 to 1999 uses the same compression tester adapter, and it does not thread in.

Interesting information...how are the injectors held in??

 

[RickB]

Interesting information...how are the injectors held in??

A tie bar built into the upper injector housing that fits over two studs mounted in the cylinder head.

Any particular reason you are supplying useless information on a topic you clearly know nothing about?

 

[HarleyHetz]

A tie bar built into the upper injector housing that fits over two studs mounted in the cylinder head.

Any particular reason you are supplying useless information on a topic you clearly know nothing about?

Wow dude, that's pretty harsh...all I was doing was try to help the OP find out which adapter he needed. EVERY single engine I've ever done a compression test on has had a threaded hole to screw in the guage. And, that includes several diesel engines. Clearly not the same engine he has, but I wasn't aware that they even made one that didn't have a threaded hole.
Don't get me wrong, I'm not doubting your word that there is no threaded hole, but the thought never occured to me that it might not. Especially with the higher compression ratios typically found in diesel engines. It seems that compression stroke after compression stroke, it would eventually push air/fuel past an injector that wasn't threaded into the head.
My apologies to the OP for misinformation about a subject that I clearly know nothing about...