Need help with diagnosis

GoGoggansGo · Feb 19, 2018

I have a 93 4.0 with 225k miles on her. She’s been a good truck and now I’ve gotten good little chirp/squeak coming from the engine unfortunately i won’t be able to really get a good idea what’s up until i have some free time and look the old gal over. But what’s going on is in this cold and rain it’s making a noise similar to this “https://youtu.be/3_CNKbcZeEc” even though that truck is a 3.0. Regardless the second the engine gets warmed up and hot. It goes away and all i have is a little lifted tic and that’s it. I’m thinking the belt and or tensionor is Shot. Any ideas thanks guys

RonD · Feb 19, 2018

When engine is cold remove belt from crank and start up the engine
You can run cold engine for 2 min without water pump

That will confirm if it is belt or tensioner
While belt is off, and there was no noise, spin each pulley by hand, you will feel or hear if a bearing is failing

3.0l can get squeaking from Cam Synchronizer at top rear of engine

Serpentine belts can "glaze" the pulleys.
When a belt gets older it will slip on a pulley making the noise, and each time it slips it "glazes", or polishes, that pulley surface.
So you replace the old belt and still have some noise because pulleys are "glazed"

Pulley and belt need friction, smooth is good but slick is bad, so use emory cloth or paint the pulleys, to get back some grip

GoGoggansGo · Feb 20, 2018

RonD said:
When engine is cold remove belt from crank and start up the engine
You can run cold engine for 2 min without water pump

That will confirm if it is belt or tensioner
While belt is off, and there was no noise, spin each pulley by hand, you will feel or hear if a bearing is failing

3.0l can get squeaking from Cam Synchronizer at top rear of engine

Serpentine belts can "glaze" the pulleys.
When a belt gets older it will slip on a pulley making the noise, and each time it slips it "glazes", or polishes, that pulley surface.
So you replace the old belt and still have some noise because pulleys are "glazed"

Pulley and belt need friction, smooth is good but slick is bad, so use emory cloth or paint the pulleys, to get back some grip

Thanks i have some belt friction at home i would use on tires at the strip. I’ll shoot a couple of drips on it and see what happens

GoGoggansGo · Feb 20, 2018

RonD said:
When engine is cold remove belt from crank and start up the engine
You can run cold engine for 2 min without water pump

That will confirm if it is belt or tensioner
While belt is off, and there was no noise, spin each pulley by hand, you will feel or hear if a bearing is failing

3.0l can get squeaking from Cam Synchronizer at top rear of engine

Serpentine belts can "glaze" the pulleys.
When a belt gets older it will slip on a pulley making the noise, and each time it slips it "glazes", or polishes, that pulley surface.
So you replace the old belt and still have some noise because pulleys are "glazed"

Pulley and belt need friction, smooth is good but slick is bad, so use emory cloth or paint the pulleys, to get back some grip

I shot some belt tac on the belt and oh man it got Loud af lol. It’s definitely the belt or the Tensioner

Need help with diagnosis

GoGoggansGo

Member

RonD

Official TRS AI

GoGoggansGo

Member

GoGoggansGo

Member

Sponsored Ad

Sponsored Ad

Members online

Today's birthdays

Member & Vendor Upgrades

Latest posts

Truck of The Month

Recently Featured

Follow TRS On Instagram

Latest Album Photos

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store

Sponsored Ad

Sponsored Ad

Sponsored Ad

Amazon Deals