High Pitch Sound under Hard Acceleration/High Speed Run

[msport]

It doesn't happen always but when I floor the RRC sometimes under hard acceleration there suddenly is this high pitch sound (like squealing) or when i reach 80-100 mph the sound also comes up. It appears to be coming from the transmission. As soon as i step off the gas pedal the sound goes away.

Any ideas or has anyone else experienced this?

TIA

[roverandom]

Since your rover is 4wd I will not assume wheel spin (joke). Is the sound at cold or fully warmed up? Do you get the same sound at partial thottle climbing a steep grade? Do you tow a trailer? What gear/s is the Rover in when it squealing start/end? The simple cause I would look for is a loose acc drive belt or pully but that is at the front of the engine. If it is coming from your transmission you will need to take a look at the oil, this will give you a good indication of what is going on inside. When did you last change the oil? Pull the dipstick and look at the oil. Is there any oil? Is it at the correct level? Is it still red? If it is black change it. If it is white you have water in your oil. If you have lots of bubbles you may have problems with the pump or oil circulation. Touch it and rub it between your fingers,(wow that sounds gay!) do you feel/see small particals like grit or dirt in the oil. If you do that is your clutch linings coming off. Do you feel/see larger matalic particals in the oil, if so then your gear teeth or pump may be damaged. Smell it, if it smells burnt (you will be able to tell right away if it is) the transmission is overheating. Any of these problems will get worse if you leave it and continue to drive the veh. Hope this helps you out.

[msport]

roverandom thanks for the inputs. to answer some of your questions:

- sound comes up even when fully warmed up.
- no sound at partial throttle climbing a steep grade.
- no trailer towing
- oil level is good and is still red

will bring it to the garage for transmission check-up just to be sure. have had it for only 4 months so it will be good to have it checked in general.

[Paul Grant]

Originally Posted by msport

will bring it to the garage for transmission check-up just to be sure. have had it for only 4 months so it will be good to have it checked in general.

So you've been driving a truck that is anywhere between twelve and twenty years old at speeds up to 80 and 100 mph with limited knowledge of how the vehicle operates or whether or not it is even physically fit for such use!

Is this your personal attempt at culling the herd?

[msport]

Originally Posted by Paul Grant

So you've been driving a truck that is anywhere between twelve and twenty years old at speeds up to 80 and 100 mph with limited knowledge of how the vehicle operates or whether or not it is even physically fit for such use!

Is this your personal attempt at culling the herd?

I got it from someone who knows his RRC's well. This one's his 3rd and it's an 88 NAS model (so that makes it almost twenty something). He's suddenly leaving for greener pastures so he had to let it go. But everything he's put in it was for keeps. The crown jewel for this one is the 4.6 HSE engine he shoehorned 2 years ago. JE Engineering tuned coupled with a JE fastroad camshaft with the requisite oil cooler and matching fuel pressure regulator from Mallory.

I have limited knowledge of operating the RRC at the trails given it's my first RR. But here in Manila who cares? The roads themselves are a challenge already. But I do know that when you have that sweet thing under your hood the only thing to do is gun it. On a wide open expressway of course.

Physically fit? He warned me of the smile i'll be getting on my face when I told him what i'd do with it.

[Paul Grant]

Keep on going. There was another guy on this board who was involved in an accident that took a life. THey were all drunk. Hell, his avatar used to be someone chuging down a beer. Live and learn. I just hope no one is in the way when a tie rod end goes on that 20 year old crown jewel. Given the condition of the roads you descibe I'd be under that twenty year old POS making sure everything was capable of dealing with the speeds you seem to think are safe. How ols are you anyway?

[astateofmike]

Originally Posted by msport

when i reach 80-100 mph

I was amazed at that! I guess I need a new engine....I could use some uphill power, but no need for that speed..

[msport]

Originally Posted by Paul Grant

Keep on going. There was another guy on this board who was involved in an accident that took a life. THey were all drunk. Hell, his avatar used to be someone chuging down a beer. Live and learn. I just hope no one is in the way when a tie rod end goes on that 20 year old crown jewel. Given the condition of the roads you descibe I'd be under that twenty year old POS making sure everything was capable of dealing with the speeds you seem to think are safe. How ols are you anyway?

Hahaha. I posted a question to seek technical advice on senior members like yourself on a problem I am experiencing. If I needed advice on living and learning I'd like to be flown there and would very much like to be a guest on Dr. Phil's show.

Am sorry to hear about the other guy. The tie rod that may go on my crown jewel (knock on wood) has already been replaced a month into my ownership. That as well as upgrading to OME steering stabilizer, replacing a worn panhard rod bushing, and adjustment of the steering preload. All brake rotors and pads have been upgraded to compensate for the increased hp of the 4.6 engine. New Bilstein shocks and LR heavy duty coil springs have been installed. Anti-sway bars are in place. The garage here who specializes in RR's do unspeakable work for a marque that is esoteric in this part of the globe.

I'm old enough. Enough to continue living and learning from whatever curve balls life may throw. You don't know what life has dished so far for me so don't go about preaching its ways as if you've lived mine.

[OkieRover]

I've had my 1993 up to 95mph a few times.
Man she runs good there. Real smooth. But I don't drive her like that normally.
Paul you feeling alright?

[OkieRover]

Originally Posted by msport

It doesn't happen always but when I floor the RRC sometimes under hard acceleration there suddenly is this high pitch sound (like squealing) or when i reach 80-100 mph the sound also comes up. It appears to be coming from the transmission. As soon as i step off the gas pedal the sound goes away.

Any ideas or has anyone else experienced this?

TIA

Squealing?
Bearing perhaps. Sounds perhaps intake based or even RPM based. Does it squeal when it's sitting still?
If no, gots to be in the transmission if you ask me.

[msport]

Originally Posted by OkieRover

I've had my 1993 up to 95mph a few times.
Man she runs good there. Real smooth. But I don't drive her like that normally.
Paul you feeling alright?

There you have it Mr. Grant. A 'few times' in a very specific expressway on a very specific stretch within it. For the simple reason that I wanted to find out what else I can 'fix' to keep the RRC in tiptop shape. The list I have above has definitely broken the bank but you can't put a price on 'life' right?

Hence my question. ^^

[msport]

Originally Posted by OkieRover

Squealing?
Bearing perhaps. Sounds perhaps intake based or even RPM based. Does it squeal when it's sitting still?
If no, gots to be in the transmission if you ask me.

Okierover, my sentiments exactly about it being transmission related as it does not squeal sitting still. Am leaning more towards RPM based since it happens while accelerating at speed, more often, when I floor it from standstill. Only because I want to see if it's always triggered by that action. At the other end of the spectrum when having reached 85-90mph the sound comes up again. Easy acceleration doesn't produce anything.

[roverandom]

Ok, all bet's are off. I did not know the engine had been swapped out for a more powerfull 4.6, this opens up a whole new can of worms. Sorry, but unless you can give us a blow by blow build up story and parts used in the conversion any info offered will be vague at best. As is the case with so many "Hot Rods" (meaning highly moded) the only one who can repair the veh is the bloke that built it in the first place. Try looking up the original owner and ask him for some input? You may be the victum of the endless quest for more power. Lots of guy's hop up engine power (even engine swap's) as a cure all for a older car. But they do not realize that the rest of the veh has been engineered for the stock horse power ONLY. The correct way to mod any veh is to start with the tire's and work your way back to the engine improving as you go. However this is backwards of the norm. This may be the problem with your Rover, the first componant has broken due to the increase in power that it was not designed for. I can still try to help you out but this is going to complicate things.

[archaeology_student]

I had a similar issues with my previous Toyota landcruiser BJ60. It turns out a bearing was going. It only whined in 4th/5th when I hit about 80-100km/h. The BJ60 had 500,000+ Km on the clock, and at that point it was time that something was going to go.

Um... Rovers are not meant for 80-100Mph!

Something about as aerodynamic as a house is not meant to go that fast.

Centre of gravity different, and it's meant to get through those country roads, and back country roads.... re-evaluate what you want, cause a Rover can do those speeds, but then it becomes a safety issue to others as well as yourself.

Just my $0.02.

[msport]

Gents,

You are a fun bunch to chide! Again, the speeds are meant to find out what else needs fixing. Other than that the house is as solidly built as they make them 20 years ago. Nothing should be left to chance so the quest continues to keep the RRC like it just rolled off the production line. It's my baby. That's why I bought it in the first place. Referring to it as a 'hotrod' is blasphemy for me. I know it's meant to be driven the unbeaten path but i'm not ready for that yet. And I also know it's not meant to run 80-100mph which is why I have other toys to play with.

I can list everything else i've done with it (including the previous owner's work). I have complete service history and parts that have been replaced over the past 10 years including the invoice for repainting it to Westminster Grey. But that's all moot.

Will check the bearing angle as well. Given as the specialist garage is 40 miles from home i'm going to need to make time to go there. But I know it has to be soon.