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Username Post: 454 lifter noise        (Topic#232258)
Forum Newbie
Posts: 80

Loc: Wilmington,DE
Reg: 12-25-09
12-25-09 09:45 AM - Post#1830248    

Hi guys,
This truck is my daily driver. 1984 Suburban 2wd 3/4 1LE8 TH400 3.73 14 bolt 144k. I bought it in October 2009. When it's cold the valvetrain is quiet but when at operating temp it gets noisy.
I've tried 15w40 and am now running 5w30 w/ MMO added but it still does same thing. I'm planning on pulling the valve covers to adjust valves but am waiting for spring so I can washdown the engine and driveway when I'm done. Anyway, I was thinking last night, what if I had a cylinder that wasn't firing?? Would that keep a valve from seating properly on a tired engine and give me a lifter noise after the engine warms up? I haven't done a tune up yet due to lack of funds. I've had more important things to replace so far to keep it on the road.
BTW- great site!!

"I refuse to tiptoe through life
only to arrive safely at death..."

"15th Year" Gold Supporting Member
Posts: 18770
Loc: Colorado Springs, CO
Reg: 08-08-04
12-26-09 06:38 PM - Post#1830867    
    In response to first_stater

You are going down in viscosity instead of going up. Your lifters are rattling because of wear opening up the clearance in the engine - you need a thicker viscosity to help plug up the gaps due to wear.

You need to use something like 20w50.

Senior Chevytalk Moderator
Posts: 24323
Loc: Austin, TX 78748
Reg: 05-09-00
12-27-09 10:38 PM - Post#1831531    
    In response to Vaughn

I wouldn't put 15WT-40WT in anything. Do you live in a warm climate? For old engines, I like 20-50. It's a little harder to start on cold mornings, but it works great when hot.

Wow, that's a big truck for a daily driver. The site is great because of its members and users.
Welcome to the site.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles

Forum Newbie
Posts: 80

Loc: Wilmington,DE
Reg: 12-25-09
12-29-09 10:15 AM - Post#1832276    
    In response to gchemist

Yep it is a big truck. Killin me at the pump but parts are cheap and its been relatively easy to work on so far. CT been a big help. I've had to get rid of my late model ride that was financed due to the recession and find something I could pay cash for and than keep running. This truck was the best I could find that would fit my budget and wasn't a POS.
I'm sure gonna need you guys to help me keep it on the road

"I refuse to tiptoe through life
only to arrive safely at death..."

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