Question about Cars & Trucks

3 Answers

Lose vales on a98 votec 350 chev.

Truck started running rough loud valve noises.Have 90,000 on rebuilt engine. Good oil pressure not over heating. Pulled driver side valve cover #4 valve is extremely lose, 3/8 or more play.Can i replace the cam and lifters.

Posted by on

  • four wheeler Dec 06, 2012

    one further thought, the rocker studs are pressed into the heads its possible for 1 or more to pull loose . check that before further tear down .

×

3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

Check pushrods , a bent one could do this . if not that probably bad cam . remove and replace cam and lifters it can probably be done without removing engine.

Posted on Dec 05, 2012

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 6,674 Answers

Determining what caused sudden slack in valves would be of concern to me, as in perhaps, changed oil brand, grade or filter incorrect?
Most small block chevy's have adjustable rocker arms. Is that not the case with yours?

Posted on Dec 05, 2012

  • Wes. Treadwell Dec 05, 2012

    I have change oil brands the last case i bought was parts pluse i have ran 10/40 in summer and 10/30 for the last 3yrs took it to local shops they wont touch say i need a new engine,my question is can i pull this intake in one piece i am not familiar with the 350 later than 88 how much differint are the vortecs. Also i was told the injectors could go bad and cause problems. the strange thing to me is no engine codes,drove it 2hrs to get so im sure i trashed the cam . Thanks for you insight Wes

  • Mike Butler
    Mike Butler Dec 06, 2012

    I've had engines that never burned any oil, begin to use a quart every 50 miles, just due to change of brands. As others suggested on here, verify that oil pressure with mechanical gauge first. I'd be tempted to replace oil with well known brand such as Castrol, Mobil, Pennsoil, as well as double check proper filter and replace it as well, if you've confirmed pressure correct and don't see any bent push rods, or defective rocker arms. Always the possibility that whoever rebuilt engine, used cheap aftermarket parts and just those defective need to be replaced. I wouldn't scrap engine until I've exhausted all those possibilities.

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 75,066 Answers

Why can't you adjust the rocker arms?

Posted on Dec 05, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

emissionwiz
  • 75066 Answers

SOURCE: loses oil pressure

Have u verified the oil pressure with a mechanical guage? this may just be a sending unit, if the engine had no pressure the lifters would be rattling like crazy at idle.

Posted on Dec 28, 2008

  • 121 Answers

SOURCE: engine is making loud noise from rocker cover area. oil pressure

tapets or camshaft has gone, check them out before you start it again

Posted on Jun 06, 2009

  • 1 Answer

SOURCE: 2.7 99 dodge intrepid skips when warm

one hydrolic lifter taps after I just spend 2,000 dollers to rebuild the heads they put all new parts on everything. I whant to know if the single hydrolice lifters can be replaced without pulling the head back off. could it be replaced by just pulling the valve cover 2002 dogde entrepid

Posted on Oct 04, 2009

alicantecoli
  • 22095 Answers

SOURCE: lifter noise top side both sides got oil presoure

put half a litre of diesel in the oil and three second squirt of fariy liquid ,no cheap stuff allowed ,run for about a week and drain oil,then with the new oil in ,using the cheapest diesel oil you can get repeat again with diesel and fairy ,by this time they should have quitened down a lot,then change oil again using a diesel oil for a turbo truck change filter as well and then change oil every 6000 miles and a filter every third oil change

Posted on Jan 12, 2010

drsinister69
  • 2317 Answers

SOURCE: 98 TAHOE VORTEC 350 JUST REBUILT REPLACED

As far as I know all hydraulic lifters can go bad, collapes or stick. And yours are definately hydraulic lifters, rollered yes, which will make them more durable, but they can go bad. The machine shop should have down a leak-down test on the lifters. That is the only way to determine if the lifters are good. I would check that you have proper oil pressure, I'm sure you do. I bought a "rebuilt head" for a Saturn DOHC engine, and the machine shop never did a leak down test on the lifters, and I had the samething happening.

Posted on Mar 17, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

5.7 votec chev avlanche 2004 . no oil pressure when started, when hit gas petal hard 3 or 4 times ,pressure comes right up. runs great after that


it is not good practice to hit the gas pedal when you have no oil pressure
not only is it wise , you have no idea what is wrong or if in that few seconds , the bearings are running dry
what I am thinking that if this started after you have had a service done , that he oil filter is el cheapo type that does not have an anti drain back valve built into the filter
when it stands the oil drains out of the filter and also drains the oil galleys so that it takes time to fill the filter and the galleys
the filter could be blocked and being bypassed as well
check and replace with a reputable make and check that it has an anti drain back valve

Nov 12, 2015 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

2002 grand cherokee engine tapping loudly


My first guess would be a failing valve lifter. They can become weak with age and not able to hold oil pressure.
Especially in an engine with that many miles on the clock.
If the noise is constant you may be able to find out which cylinder by running a compression test. maybe.

Apr 08, 2013 | 1997 Jeep Grand Cherokee

1 Answer

My 95 tahoe has an occasional ticking noise, loss of oil pressure at idle and loss of power


Prognosis is really bad, hate to tell you. Ticking comes from the valve lifters, losing lubrication due to lack of pressure and running dry. At redlights, when revs are at idle, oil pressure drops a lot, and engine really suffers. Have the vehicle taken immediately to a shop for proper diagnose and to see if engine can still be saved. The loss of power comes from the valves not actuating properly. Hydraulic lifters need oil at a decent pressure to "charge" , and if not charged, they will stay compressed, ruining valve lifting operation.

Apr 05, 2012 | 1995 Chevrolet Tahoe

1 Answer

Low oil pressure light came on engine madee noise and died will not start but makes growling noise whe n trying to start


Sounds like you lost oil pressure and possibly the engine is shot due to losing pressure. It's possible the timing belt/chain broke. Even if this is this is the case, usually it requires valves replaced and head rebuilt/replaced.

Jun 13, 2011 | 2003 Isuzu Rodeo

1 Answer

Low oil pressure 93 GMC P/U w/350 motor w/205,000 miles gauge


While engine is running, open the cover where you add oil to engine and see if you see a good flow of oil, if good flow, could be as easy as replacing oil sending sensor. got to realize that if poor maintenance history your engine may not be building enough pressure at iddle to move your hydraulic operated valves, only when you rev it up it will pump enough to run smooth. if running engine too long, you may cause more damage to other engine components such as crankshaft and cam shaft bearings. if you can spare a few bucks, have a good mechanic check your oil pressure with a mechanical gauge. another cheap option is to replace oil pump. last resort if you love your truck as much as we do,replace engine or rebuild it. At 205,000 this is a normal symptom, other than timing chain problems, most engines don't make it that far. hope this helps!

Mar 01, 2010 | 1993 GMC Sierra K1500

1 Answer

Undeterminable engine nosie 2006 Chev express van, 4.8 votec


Yes, it is a mechanical oil pump. Just for peace of mind, you could have the oil pressure checked. A mechanic shop could do it real easy-you remove the oil pressure sensor or sending unit from the engine block and hook up a "mechanical oil pressure gauge", then run the engine with gauge attached and check pressure against the specs for your model- it is a specified pressure at a specified engine rpm. I f oil pressure is within specs, I can't imagine anything else about the pump that could cause that noise. It is a compact unit with a couple of heavy internal gears.

If your mechanic didn't think it was a bearing or rod either, you should be safe there. He would know the sound of a rod bearing or mechanical problem like that, and if it is different from your sound. Beyond that and the oil pump, I just don't have any ideas.
Hope you find it, good luck.

Mar 14, 2017 | 2006 Chevrolet Express

1 Answer

Noise coming from engine


are you getting oil pressure when the car is warm have you changed the oil recently or is it overdue if you have an oil pressure gauge on your dash check to make sure you are getting propper oil pressure as this is what it sounds like you are losing oil pressure and your valves are tapping.

Mar 20, 2009 | 2001 Ford Taurus

1 Answer

Loses oil pressure


Have u verified the oil pressure with a mechanical guage? this may just be a sending unit, if the engine had no pressure the lifters would be rattling like crazy at idle.

Dec 04, 2008 | 1997 Oldsmobile Aurora

1 Answer

350 Chev Engine Irregular Bore Wear


what sort of rings were used.you could cut open the oil filter and see whats in there what condition were the bottom end bearings in.running too hot?what sort of pistons,forged or cast?how was it run in

Oct 09, 2008 | Chevrolet Chevy Cars & Trucks

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

194 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

75051 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...